Via [url=]the Steam Community[/url]:

[quote=Valve][b][ GRAPHICS ][/b]
- Fixed a case where feet would appear black when looking down at them through a scope
- Fixed a memory leak due to particles

[b][ ANIMATION ][/b]
- Fixed several hitbox alignment bugs
- Fixed knife spinning not feeling as fast as in CS:GO
- Fixed the bolt not moving during the M4A4 and M4A1-S deployment animations
- Fixed a bug where weapon inspect could interrupt the silencer toggle animation

[b][ MAPS ][/b]
- Various bug fixes and tweaks to Mirage, Vertigo, and Nuke

[b][ MISC ][/b]
- Fixed several bugs with "Looking to Play"
- Various bug fixes and tweaks to weapon finishes and stickers
- Fixed a bug where loadout changes weren't saved if the game was closed shortly after making changes
- Fixed a bug where Steam Friends' match status was delayed or missing
- CPU performance improvements for weapon tracers
- Added an official matchmaking datacenter in Chengdu, China[/quote]

Rumor has it:

- Size is close to 700 MB (with Workshop Tools installed) - data capped users should be prepared to take action