Via CS:GO Blog:

KRAKOW 2017

• Engraved the Krakow 2017 Champions on the in-game trophies, and adjusted the inspect animation to make engraved champions readable.
• Adjusted the trophy icon silhouette to disambiguate Major Championship in-game trophies from other coins.
• Added commemorative graffiti.

MAPS

• Fixed some minor graphical bugs on Inferno.
• Added support for Wingman game mode on Overpass.

SOUND

• Upgraded several surface sounds to 16-bit for HRTF support.

MISC

• Several performance optimizations in sound playback.