Via [url=http://blog.counter-strike.net/index.php/2015/08/12254/]the CS:GO blog[/url]:

[quote=Valve][B][ESL One Cologne 2015][/B]
– ESL One Cologne Player Autograph Capsules are now available for purchase, with 50% of the proceeds from capsule sales going to the players and organizations. Player Autograph Stickers can be used as game pieces in the Cologne 2015 Player Pick’Em Challenge.
– ESL One Cologne Team Stickers are now available for purchase, with 50% of the proceeds from sticker sales going to the organizations. Team Stickers can be used as game pieces in the Cologne 2015 Team Pick’Em Challenge.
[B][UI][/B]
– Updated the Watch panel
— Added the Cologne 2015 Pick’Em Challenges and Matches.
— Your matches and tournament matches are now presented with an updated scoreboard and round performance panel
[B][MISC][/B]
– [Linux] Fixed bug where bomb beeping was not playing on all channels.
– [Windows] Added a graphics driver hint to try to use the dedicated GPU when available on laptops.
– Minor volume and pitch adjustments to weapon equip and reload sounds
– Fixed a sound synchronization bug with some Falchion knife animations[/quote]

Rumor has it:

- [B]STICKERS![/B] [url]http://www.counter-strike.net/pickem/cologne2015[/url]

- GamingRedditor [url=https://www.reddit.com/r/GlobalOffensive/comments/3h1rey/counterstrike_global_offensive_update_for_81415/cu3gms7]has an image of the revamped Watch menu[/url]

- Operation Bloodhound passes are now 50% off - [url=https://www.reddit.com/r/GlobalOffensive/comments/3h1rey/counterstrike_global_offensive_update_for_81415/cu3hayl]thanks to SpaceShuttleFan for the tip![/url]

- Strings and script changes (bring your own differ or append .diff to the end of the URL): [url]https://github.com/SteamDatabase/GameTracking/commit/b1578fb93c4f4161efb6c638ed2f266777e1c90c[/url]

- An item schema update (some stuff was already added in): [url]https://github.com/SteamDatabase/SteamTracking/commit/624c6d775bcc092f5e65d2a30bfa92462a00a841[/url]

- Size is ~70 MB