Via [url=https://steamcommunity.com/games/CSGO/announcements/detail/702141174212723088]the Steam Community[/url]

[quote=Valve][b][u]MAPS[/u][/b]

[b]Cache[/b]
- Bomb explosion radius increased.
- Lighting Adjustments around Vent.
- Disabled player collision on sign and removed lamp by squeaky.
- Reworked e-box on A-site for better visibility.
- Lowered Checkers entrance frame height at B Main.
- Removed AC unit above Sandbags and moved pipes.
- Fixed lack of footstep sounds on top of crates at A-site.
- Fixed hole in world on door in Sun Room.
- Fixed wall bangs on A Main wall.
- Fixed some z-fighting around Garage.
- Adjusted grenade clipping throughout map.
- Adjusted player clipping throughout map.

[b]Dust II[/b]
- Blocked visibility through corner of Mid Box (Xbox).

[b][u]SOUND[/u][/b]
- Speculative fix for a case where all audio drops out.

[b][u]MISC[/u][/b]
- Fixed cases where crouch-jumping in confined spaces could cause the player camera to intersect the ceiling.
- Adjusted particle effect sprite opacity for fully occluded flashbangs.
- Improved smoke lighting consistency.
- Minor adjustments to dropped pistol magazine velocity.
- Ambient Occlusion adjustment settings in Environment Blend shader restored.
- Fixed a case where money was subtracted from the wrong player during bot takeover.[/quote]

Rumor has it:

- Size is ~625 MB (with Workshop Tools installed)