Via [url=https://steamcommunity.com/games/CSGO/announcements/detail/508485755865137964]the Steam Community[/url]:

[quote=Valve][b][u]ANIMGRAPH 2[/u][/b]
- Fixed XM1014 shells flickering when starting a reload.
- Fixed bugs with dual berettas in first person and in spectator mode.
- Fixed inspect/cancel causing multiple worldmodel deploys.
- Fixed a bug where players can get stuck in a planted-turn state.
- Made foot IK transitions smoother.
- Adjusted the firstperson in-air crouch transition time to match the thirdperson animation better.
- Fixed a case where high frequency stutter steps would cause large pose changes.
- Fixed a case where legs would snap when quickly stopping and then continuing in same direction.
- Adjusted thirdperson bomb plant animation to more closely match firstperson animation.
- Minor adjustments to viewmodel animations.

[b][u]MISC[/u][/b]
- Fixed random crash on startup when a non-default Audio Device was specified in settings or when sound_device_override was specified in a config file or on the command line.
- Adjusted official map guides to match new surface smoothing.
- Dropped weapons with silencers now correctly reflect the silenced state.[/quote]

Rumor has it:

- Size is ~125 MB (with Workshop Tools installed)