Via the CS:GO blog:

OPERATION WILDFIRE

• Fixed the first Co-op Strike mission not granting a star if players did not win in the first round.
• Added a countdown timer to main menu missions UI indicating when the next campaign mission is available.
• Fixed the Mission UI not updating immediately when the next campaign mission is available.

LINUX

• Fixed a crash that was occurring on Coast and some other maps.

Rumor has it:

• Team Roles stickers had their materials updated, but they're the foil ones, which for now aren't available (except The Pro, only available in foil): https://github.com/SteamDatabase/GameTracking/commit/ce58e335b419b293c9510069d30d3efb4d346016

• Size is ~20 MB