Via [url=https://steamcommunity.com/games/CSGO/announcements/detail/685254577766793433]the Steam Community[/url]:

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

[b]Cache[/b]
- Adjusted player and grenade collision.
- Adjusted material blending to improve accuracy of footstep sounds.
- Fixed several gaps reported by players.

[b]Ancient[/b]
- Fixed a gap in the wall.[/quote]

Rumor has it:

- Size is ~750 MB (with Workshop Tools installed)