Via [url=https://steamcommunity.com/games/CSGO/announcements/detail/520830071182721027]the Steam Community[/url]:

[quote=Valve][b][u]PREMIER[/u][/b]
- Premier Season Two is here, and Premier matchmaking has resumed
- Every player who earned a CS Rating during Season One will receive a commemorative Premier Season One Medal which includes detailed Season Statistics
- Every player will have their CS Rating recalibrated based on their Season One performance, and will need to re-establish their CS Rating by winning 10 matches
- Train has been added to the Active Duty map pool
- Vertigo has been removed from the Active Duty map pool

[b][u]GAMEPLAY[/u][/b]
- M4A4 price reduced to $2,900
- FAMAS accuracy improved and price reduced to $1,950
- Reduced crouching accuracy for the MP9, MP5-SD, and MP7
- Adjusted scope dot on AUG/SG to be more useable at range

[b][u]UI[/u][/b]
- Added a new radar dynamic zoom option that will grow or shrink the radar to include your team mates, bomb and other detected elements
- Adjusted grenade order in spectator UI to match weapon selection order
- Increased brightness of carried C4 in UI

[b][u]MAPS[/u][/b]
[b]Train[/b]
- Removed a boost angle from Long Dog to Bombsite A
- Fixed lighting artifacts on double-sided materials

[b][u]MISC[/u][/b]
- Added fallback logic to allow playing incomplete demo files, either copied from an ongoing live match or recovered after a game server crash
- Fixed an exploit where users could use secondary fire on R8 Revolver and then sell it back
- Counter-strafe summaries are now available in game server log data distributed via log address in addition to console logs[/quote]