Via [url=https://steamcommunity.com/games/CSGO/announcements/detail/698770449667982801]the Steam Community[/url]:

[quote=Valve][b][u]GAMEPLAY[/u][/b]
- The bomb damage health preview is now revealed when the bomb becomes audible.
- The bomb explosion now interacts with smoke grenade clouds and molotov/incendiary fire.

[b][u]MAPS[/u][/b]
[b]Fachwerk[/b]
- Updated to the latest version from the Community Workshop ([url=https://steamcommunity.com/sharedfiles/filedetails/changelog/3442040035]Update Notes[/url])

[b]Boulder[/b]
- Updated to the latest version from the Community Workshop ([url=https://steamcommunity.com/sharedfiles/filedetails/changelog/3663186989]Update Notes[/url])

[b]Debris[/b]
- Updated to the latest version from the Community Workshop ([url=https://steamcommunity.com/sharedfiles/filedetails/changelog/3539217452]Update Notes[/url])

[b][u]MISC[/u][/b]
- Added Workshop maps section to Play menu for Counter-Strike in Steam China.
- Added a shortcut to Community Servers list to Play menu for Counter-Strike in Steam China.[/quote]

Rumor has it:

- Size is ~1.5 GB (with Workshop Tools installed)