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

[quote=Valve]- Revolver and Pistol Killstreak Kits now properly work on decorated weapons
- Rescue Ranger bolts now properly heal friendly mini-sentries
- Vaccinator Über bubbles once again work on Reanimators in Mann vs Machine, but now instantly fills them by 90%
- Fixed cosmetic items with an ambient particle effect (i.e. Soldier's Stogie, Nine-Pipe Problem) erroneously reporting that they had the Genteel Smoke unusual effect
- Fixed Stickybombs not properly having distance fall off for the first 5 seconds of their life time
- Fixed an issue with The Sandvich where consuming it at full health would consume it forever
- Fixed The Dalokoh's Bar giving medium health kits when thrown. Now properly gives small health kits when thrown
- Fixed suicides counting for the "Get a kill on Powerhouse" Contract objective
- Fixed a issue with The Box Trot taunt when window focus changed
- Fixed a case where speed-line particles were visible for enemy players when a Spy triggered the Dead Ringer
- Fixed The Scorch Shot not applying its small knockback on non-burning enemies
- Fixed The Scorch Shot knockback from effecting Quick-Fix Über
- Fixed The Wrangler not properly disabling Sentries for 3 seconds on Engineer death
- Fixed a case where textures and models would fail to load on maps with embedded resources
- Fixed an exploit related to instantly completing a payload map while taunting and picking up dropped weapons[/quote]

Rumor has it:

- Local servers, ones created using the create server button which appears as a + symbol (or through console commands), AKA "listen" servers, now result in crashing when nearing completion of loading
- [b][url=http://www.teamfortress.tv/post/455451/tf2-update-for-7-8-15-7-9-15-utc]Update #2 fixes this, be sure to download it too if you need to use a listen server[/url][/b]

- Size is ~10 MB