Via [url=https://blog.counter-strike.net/index.php/2019/05/24314/]the CS:GO blog[/url]:

[quote=Valve][ DANGER ZONE ]
– Blacksite and Sirocco are now both available in official Danger Zone matchmaking as a time-based map rotation.
– Radar jammers block drone pilots with static interference while the jammer is active.
– Drones fly slower when carrying paradrop crates.
– Armor starting equipment option will now give both armor and helmet.

[ MISC ]
– Updated SDR libraries to the latest version.
– Restricted start of client-side demo recording on dedicated servers to warmup and freezetime.

[ MAPS ]
Vertigo:
– Changed Wingman version to use bombsite A.
– Bombsite A changes:
– Pushed back cover on site.
– Tightened final ramp up to site.
– Moved position of crane slightly, made area around it accessible.
– Shortened wood fence, letting CTs more easily control ramp or drop down.
– Moved scaffolding in back of A forward towards the wall.
– Added self-boost onto concrete formwork on A site.

Sirocco:
– Added missing collisions to various door/window frame models.
– Fixed another player stuck spot.[/quote]

Rumor has it:

- Protobuf changes for Steam Datagram system library updates and script changes aplenty: https://github.com/SteamDatabase/GameTracking-CSGO/commit/ebd169685b14ebf9e00b1594ede48e07df9f4045

- As has been the case with the last several updates, this one also includes a healthy dose of translations, which are made possible in part by contributions from [url=https://translation.steampowered.com]Translators Like You - Thank You[/url]

- Size is ~110 MB