Via [url=http://blog.counter-strike.net/index.php/2015/07/12140/]the CS:GO blog[/url]:

[quote=Valve][ MISC ]
– Fixed smoke rendering exploits that were possible when running certain video capture applications.
– Fixed rare issues when equipping the same loadout item for both teams.
– Fixed an issue where the list of tournament matches would not refresh.
– Added official game servers cluster in Atlanta.
[ SOUNDS ]
– Added new carpet footstep sounds.
– Tweaked sounds of suits when running to synchronize with footsteps.
[ MAPS ]
-Overpass
–Made first train event predictable, train will start 10 seconds after Ts leave their spawn tunnel
–Implemented area sound for train, can now use sound reliably throughout B site to hide grenade sounds, footsteps etc.
–Fixed a see-through texture near Bombsite A towards upper park
-Dust II
–Fixed 30 exotic spots where C4 could get stuck[/quote]

Rumor has it:

- Here's what sounds got changed: [url]https://github.com/SteamDatabase/GameTracking/commit/09a15fcd02a7396d456cd371e711a08ce2b9e0bb[/url]

- [B]The bomb detonation sound got altered, and it sounds a whole lot more badass than it did previously[/B]:
[youtube]https://www.youtube.com/watch?v=g6WcnUIyu0I[/youtube]

- The 2015 service medal will be ready for claiming as it's been included in this update
- And here's some relevant GC protobufs that enable claiming of it: [url]https://github.com/SteamDatabase/GameTracking/commit/f3b2c68a8895c5f1e9f64d7fbd6ebda83f144e30[/url]

- Size is ~55 MB