Additions:
Added graphics option to enable SMAA.
Added ability to pose/mirror mannequins.
Added ability to delete cosmetics/skins.
Accepted a few new curated workshop items.
Improvements:
Updated from Unity 5.2.5f1 to 5.4.0p4.
Improved every single light to use emissive textures rather than halos.
Improved server info to list names of workshop files installed.
Improved server info screen to show config changes.
Improved nightvision glow to enable/disable.
Improved taclaser/rangefinder to work in 3rd person.
Tweaks:
Tweaked horde beacon zombie health to not scale up as much.
Tweaked several more items to be scrapable.
Tweaked zombies to gradually wander to where they came from when pulled.
Fixes:
Fixed siphoning/refilling exploded vehicles.
Fixed incorrectly placed window slots in mansion_0.
Fixed profanity filter to cover server name/description.
Fixed a potential exploit with group IDs when joining server.
Fixed server info screen and in some cases drops not closing all menus.
Fixed server disabling all resources.
Fixed to completely prevent placing items that intersect a character.
Fixed to dequip item if obstruction check fails serverside.
Fixed invisible face_0 when refreshing character.
Fixed dropship missing engine audio.
Fixed a few possible issues with effect cleanup.
Fixed looping bullet impact particles.
Fixed arena mode returning duplicate effects to the pool.
Unity Upgrade:

The biggest timesink this week was getting everything working again with the new version of Unity, and for the most part it's all fixed up as far as I can tell, but there are a few important changes for mod creators:
Asset bundle system has been changed, and the official tool in Bundles/Sources/Tools has been adjusted accordingly. Due to a change with shaders in asset bundles any older materials exported with previous versions of Unity will be converted by Unturned to the Standard shader when imported. New bundles you create should now include the line "Asset_Bundle_Version 2" in your .dat file to disable this conversion.
Light halos are broken in this 5.4 patch, but don't look very good and I'd been meaning to replace them anyway. I went through every single light in the game and converted them to use emissive textures instead of the halos, and would recommend you do the same. Each case where a halo might have been used was updated in the examples folder along with the documentation.
5.4 complains about the negative boxcolliders with the flipped left-handed hitbox, but still works fine and can't really be changed at this point, so I disabled the normal output_log.txt and instead messages/exceptions are now appended to Logs.txt and LogsPrev.txt. This also means that errors can still be grabbed if the game was restarted, and are easier to find on Mac/Linux.
VR level editor got pretty borked by the upgrade as well - with 5.4 it seems the assumption is that a game is either VR enabled/disabled so it's not very happy swapping at runtime, for the mean time it's disabled but fortunately nobody's using it as far as I know.
Item Filters/Tags:

Valve has added support for filters in the market/inventory! I know this has been frequently requested so I got them enabled as quickly as possible - the inventory page should show them all, but it might take a bit for all the market filters to update. Right now the rarity/mythic tags aren't color coded, but once that feature is available I'll make sure to enable it as well.

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http://steamoss.com/games/304930/announcements/detail/858322453094187331

Additions:
Added new server info screen when connecting.
Added ability to rotate items in display storage.
Added graphics options to enable/disable ragdolls and debris.
Added config options for remaining gamemode differences.
Added craftable sandwiches for all meats/fishes. [IDs 1398-1407]
Added Mannequins. [IDs 1408-1409]
Added Plaques. [IDs 1410-1413]
Improvements:
Improved performance of several core systems.
Tweaks:
Tweaked medium/small engines to use the old audio.
Fixes:
Fixed potential cause of storage stuck in "busy" state.
Fixed wind rapidly changing direction.
Fixed detect radius multiplier to apply to all alerts.
Fixed amount of ammo in Matamorez Box.
Fixed repairing fishing rods rather than scrapping.
Fixed dropped clothing losing metadata.
Fixed placement of several bridges on Russia.
Fixed several easily abused spots in tank train tunnel.
Server Info:

Now when browsing the server list you can click on a server for more information about it before joining. If you host a server you can also include some extra details by setting a URL to a .png or .jpg icon and a short description in the Config.json file.

Config:

Options such as hitmarkers, crosshairs, ballistics and maps are now available in the gameplay config section, and zombie speed in the zombies section. There's also a new feature to prevent repairing higher tier weapons.

Performance:

The most notable optimizations are many repeatedly created elements now getting pooled/reused, and much more aggressive automatic batching (some mods might need to tweak their texture wrap settings due to this), but several other features were improved as well. From here the next step I hope to take is upgrading to a more up-to-date version of Unity, although this is made tricky because of a physics change between 5.2 and 5.3 affecting many of Unturned's features.

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http://steamoss.com/games/304930/announcements/detail/856070069423872383

Additions:
Added HMG to Hind and HMG Box. [ID 1395]
Added Ghillie Netting. [IDs 1396-1397]
Added support for server plugins to request client to view URL.
Added guide for creating community updates.
Improvements:
Improved wheeled vehicle audio.
Improved objects to save by file name rather than ID.
Tweaks:
Tweaked several more actions/sounds to attract zombies.
Tweaked generator/fire/drill noises to be less annoying.
Tweaked bans to apply by IP as well as steam ID if the target is connected.
Tweaked streamer mode to hide slightly more info.
Fixes:
Fixed hole in roof at end of metro tunnel.
Fixed farm tractor spawns.
Fixed note_18 line count.
Fixed fire_1 side door slot.
Fixed gap in silo radio tower ladder.
Fixed floating bush near junkyard.
Fixed floating lights at mansion.
Fixed confusingly placed boat objects.
Fixed switches at factory/junction.
Fixed several jumps in main line tracks.
Fixed zombie spawn in airport rafters.
Fixed zombie spawn in wall of camp cottage.
Fixed incorrect boat spawns in wrong places.
Fixed mafia zombie drops spawnrate.
Fixed up collision issues a bit with Mooki's objects.
Fixed underground zombie/vehicle spawns in front of airport.
Fixed missing and/or over exaggerated rubble at crashes.
Fixed military sandbag wall bottom face.
Fixed zombies getting stuck on camp docks.
Fixed zombies getting stuck in some firewatches.
Fixed Russian flag gib material.
Fixed rubble gibs to match object scale.
Fixed destroying generator not disabling power.
Fixed player arrow to show on top of group icons.
Fixed makeshift vehicle world collision heights.
Fixed new bunkers missing death barriers.
Fixed oxygenator not working on vehicles.
Fixed car bumper damage when crashing into high density of objects.
Fixed applying interactable object animation state when loading area.
Fixed cases in multiplayer where item physics could load before objects.
Community Update Guide:

Following the release of Russia I've put together the start of a guide based on what I learned from teaming up with workshop modders to help open up the opportunity for others, and I'm very excited about the potential for a few 100% community created updates! It will be adjusted over time to cover more aspects as feedback comes in. Here's the link:

View Guide

Russia Map Crash:

If you are experiencing a crash while loading the Russia map then judging from submitted log files it's quite likely Unturned is running out of RAM/memory! In most cases this is due to preloading large amounts of workshop content - so as a temporary workaround you can unsubscribe from extra workshop files.

Object IDs:

If you have custom objects in your map chances are you've run into some ID conflict issues before. Maps saved after this update will now only use the ID as a backup

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http://steamoss.com/games/304930/announcements/detail/865076494921021332

Additions:
Added Russia map and associated content.
Added Russia Map Mystery Box.
Added Arms Shipment Mystery Box.
Added effect nodes for different ambient sounds/lighting.
Added Precision Charge. [ID 1393]
Tweaks:
Tweaked to give XP for healing other players.
Fixes:
Fixed object power search while loading on server.
Fixed workshop to show preview warning with >1MB image rather than failed to submit.
Fixed crafting magazines not showing ammo total.
Fixed minigun barrel spin not visible to other players in multiplayer.
Fixed not playing out of ammo click noise.
Fixed some bugs with attachments and skins toggle.
Fixed Instinctive Timberwolf skin attachment color.

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http://steamoss.com/games/304930/announcements/detail/868453699861096224

Additions:
Added landmark LODs for most large objects.
Added automatic landmark LODs for trees.
Added landmark draw distance option.
Added region complexity to visibility menu in editor.
Added config options for losses from combat vs environment deaths.
Added buttons to enable/disable skins and mythics in-game.
Added new faces and wheel of emotions to gestures menu.
Added new hair and beard styles.
Added smoothed camera mode. [Default F5]
Accepted several new curated workshop items.
Improvements:
Improved road vertices to have adjustable offset.
Improved spawn tables tool to allow editing.
Tweaks:
Tweaked undriven vehicles to not damage players.
Tweaked muzzles to decrease drop slightly.
Fixes:
Fixed barrel bullet drop multiplier not applying.
Fixed to include scaling in copy transform.
Fixed first person muzzle flash light.
Fixed workshop agreement link appid.
Map:

As expected more required objects popped up alongside final steps like spawn tables, but everything's coming together so I think it's safe to say you'll be seeing more about the new map very soon!

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http://steamoss.com/games/304930/announcements/detail/868452959168057750