Via HLDS:
Valve- This update will most likely cause issues with custom UIs and HUDs. We suggest disabling them if you experience any problems.
- Updated content and features for the TF2 Competitive Mode beta
- For more information on how you can participate in testing, please visit https://steamcommunity.com/groups/tfcompetitive
- Fixed the Demoknight contract counting suicides as contract progress
- Updated the Batman: Arkham Knight promo items so they can be traded
- Updated model/materials for the Escapist and the Cute Suit
- Last hit sounds no longer consider the time of the previous hit sound
- Fixes the sound not playing if you damaged an enemy too close to landing the last hit
- Updated ctf_thundermountain
- Fixed being able to build on rocks outside of the fence by the capture points
Rumor has it:
- Lots of .res file changes (and some stuff may be mixed in from update #2, just FYI): https://github.com/SteamDatabase/GameTracking/commit/d928f43f3b75b3f707eea2e6ea40879c51bd85c7
- And an item schema update (as well as one for CS:GO, append ".diff" to the end of the URL if you want to see that one): https://github.com/SteamDatabase/SteamTracking/commit/e228357fb426de287a73ff4f588dedab29aec16c
- Plenty of deep-level changes (mixed in with a few CS:GO things): https://github.com/SteamDatabase/GameTracking/commit/d733e129bb4cd3b6439f49a665e6cc2b6fc90c87
- Size is ~65 MB
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Windows 7 and 8.1 users that haven't changed Windows Update settings since installation should take action now if for whatever reason, they do not want Windows 10 yet (or at all) to avoid a rude awakening during a TF2 match.