Via [url=https://steamcommunity.com/games/CSGO/announcements/detail/499470950023037645]the Steam Community[/url]:

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

- Damage from HE grenades that explode mid-air near the ground will no longer be calculated as if they exploded on the ground.

[b][u]SOUND[/u][/b]
- Various knife sound adjustments.

[b][u]MISC[/u][/b]
- Performance optimizations for exploding chickens.
- Fixed a map scripting bug where Entity.SetOwner wasn't accepting undefined.
- Added a method for community maps to save modified user settings. Running 'host_writeconfig_with_prompt' will prompt the user for permission to save. If accepted, some of the modified settings (radar, viewmodel, safezones, etc) will be kept after the map exits.
- Community maps are now restricted to a smaller list of allowed console commands.

[b][u]MAPS[/u][/b]
[b]Stronghold[/b]
- Updated to the latest version from the Community Workshop ([url=https://steamcommunity.com/sharedfiles/filedetails/changelog/3477094554]Update Notes[/url])[/quote]

Rumor has it:

- Size is close to 900 MB (with Workshop Tools installed)