Via [url=http://blog.counter-strike.net/index.php/2017/05/18727/]the CS:GO blog[/url]:

[quote=Valve][ PERFECT WORLD ]
– Enabled friends competitive leaderboards, scorecards, Hydra Campaign Guardian Missions, and War Games Event XP support on Perfect World official servers.
[ OPERATION HYDRA ]
– Prevent procedural placement of spawn points in locations where players would be stuck.
– War Games maps now change every day.
– Fix a bug where suicides could sometimes count towards the objective in Guardian missions.
– Fix a bug in “Any Pistol” Guardian missions that prevented CZ75-Auto kills from counting towards the objective.
– Fixed a bug where Guardian journal would show wrong target kill amounts on certain missions
– Fixed a bug that caused players to not be able to buy between waves in extremely long Guardian rounds.
[ UI ]
– Fixed numbering of players in competitive spectator HUD to have increasing numbers from top to bottom for both teams.
[ MISC ]
– Fixed max round loss bonus regression.
[ MAPS ]
-Rialto
–Added npc clips to prevent bots falling in the water.[/quote]

Rumor has it:

- Users under Perfect World influence that have been online for longer than 3 hours will not have their missions count as completed as part of China's anti-addiction system, and they won't get full mission XP either

- In said extremely long Guardian rounds, mp_buytime is now 1800: https://github.com/SteamDatabase/GameTracking-CSGO/commit/905fef162c9ca4cb409fa653f909e6a66549e9ed

- Size is ~20 MB