Via [url=https://list.valvesoftware.com/cgi-bin/mailman/listinfo/hlds]HLDS[/url]:

[quote=Valve]
- Added Collection Trade-Ups!
- Check out the blog post for more information: [url]http://www.teamfortress.com/post.php?id=18161[/url]
- Added Map Stamps and Strange Filters for the featured maps in the Gun Mettle Campaign
- Added the Gun Mettle Cosmetic Case which contains new community cosmetic items
- Gun Mettle Cosmetic Case can only be found by players with a campaign coin
- Cosmetics in a collection can be listed on the Steam Community Market
- All Strange items now have a visible icon in backpack panels
- Added an option button to display paints and/or styles options for items in the Mann Co. Store preview page and the Steam Workshop item import tool
- Added the OWL 14 tournament medals
- Added a Steam Community Profile option to the player right-click context menu in the scoreboard
- Fixed a buffer overflow exploit (thanks to Didrole for this report)
- Fixed a Mann vs. Machine exploit related to purchasing upgrades while not at an upgrade station
- Fixed a Mann vs. Machine exploit related to the Medigun shield
- Fixed the Gun Mettle Coin not displaying its proper level in the Steam Community view
- Fixed the Enforcer getting a damage bonus as the Spy was disguising and not fully disguised
- Fixed the cvarlist command truncating some cvar/command descriptions
- Fixed hitting 'Enter' while in the backpack menu triggering buttons in the main menu
- Fixed invalid map names in nextlevel convar or the map cycle causing the server to fail to change level after displaying the score panel
- Fixed the Engineer losing revenge crits and picked-up weapons after using The Eureka Effect to teleport back to base
- The Dalokohs Bar can now accept Ally Healing Done strange parts
- Updated several HUD elements to include the name of the weapon's owner when a player is carrying a weapon they picked-up
- Updated the materials for the Stickybomb Launcher
- Updated Mann Co. Store prices for foreign currencies to current USD equivalents
- Updated the localization files
- PASS Time update
- Fixed scoring in your own goal if you change teams while the jack is in flight
- Fixed disguised and cloaked enemy Spies having a shield drawn for them in the HUD
- Fixed players sometimes not being able to throw the jack
- Fixed another case where players could teleport the jack with The Eureka Effect
- Fixed The Dead Ringer making it impossible to throw the jack or deactivate the Dead Ringer
- All global special abilities that are activated with alt-fire are now available while carrying the jack, unless you're actively aiming the jack
- Unlocked console variables for community servers to experiment with without requiring sv_cheats
- Fixed Scouts being able to pick up the jack while drinking
- Fixed disguised Spies being able to carry the jack in some situations
- Made weapon switch faster after throwing the jack
- Fixed not getting a speed boost if you score and then get the jack after it respawns
- Fixed a crash if mp_tournament was enabled and someone scored during pre-game
- Improved the way blocking works
- Fixed being able to cancel enemy taunts by hitting them with the ball
- Fixed seeing a phantom jack in your hand if you threw the jack and couldn't switch back to your previous weapon (jars, cleavers, etc.)
- Updated pass_warehouse
- Fixed issue with jack getting stuck behind props
- Fixed exploit of jack getting stuck in dropper
- Fixed issue with unbalanced ammo and health kits
- Moved resupply closets further from the doors
- Added plank walkway to central warehouses on top of the containers
- Server Browser
- Fixed the history tab of the server browser failing to record servers
- Fixed the spectate tab of the server browser not working at all
- Fixed the game info dialog for SourceTV master servers improperly showing the server as not responding
- Fixed connecting to SourceTV servers via the Favorites tab in the server browser
- Fixed SourceTV relay servers not properly registering on the server list in some situations
- Fixed the game info dialog for SourceTV relay servers not allowing connection despite open slots
- Fixed SourceTV relay servers appearing to have negative max players
- Maps Workshop Beta
- Fixed map cycle files specified before the initial map load not properly tracking workshop maps
- Fixed game servers using registered accounts via sv_setsteamaccount being unable to access workshop content
- Fixed servers getting stuck in a loop when the nextlevel convar contains a un-loadable workshop map[/quote]

Rumor has it:

- GC protobufs: [url]https://github.com/SteamDatabase/GameTracking/commit/466632af9dedd42afec536479878b6d917f980cf[/url]
- [B]There's a lot of competitive matchmaking stuff![/B] A breakdown of just the competitive related protobufs [url=http://facepunch.com/showthread.php?t=1483126&p=48555419&viewfull=1#post48555419]can be found on Facepunch[/url]

- Item schema update: [url]https://github.com/SteamDatabase/SteamTracking/commit/013633351fdb9a24c815af21ed48d7d9e8d2d9e9[/url]
- wiethoofd of reddit (our new HUD teardown guy?) decided [url=https://www.reddit.com/r/tf2/comments/3innvo/tf2_update_for_82715/cui0r68]to break down the item schema this time around[/url]

- Strings: [url]https://github.com/SteamDatabase/GameTracking/commit/59ac2010593f2401827d7f1f865f13f543f7cf28[/url]

- Size is close to 75 MB