Via the CS:GO blog:
Valve[ MAPS ]
Crete
– Lowered window through site.
– Blocked one of the windows at top of mid.
– Raised planks on dropdown route.
– Fixed various bomb stuck spots and pixel boosts.
– New sun angle.
Iris
– Reduced window height on Heaven B-site.
– The glass window in the office is smaller.
– Moved chairs that obstructed player movement in Ice Cream (Thanks fl0m).
– Removed the Jerry Can on B-site that gave CTs an unfair advantage (Thanks HOFFI).
– Slight FPS increase across the map.
– Removed some clutter around the map.
– Increased readability on various spots around the map.
– Fixed floating props, clipping and nodraw textures (Thanks Joaokaka1998).
– Visual improvement to CT spawn.
– New radar image.
– Added callout place names.
Ember
– Further improvements to optimization.
– Added new geysers at Apartments and Lava Pit.
– Added new entrance to Lighthouse.
– Added ladder at Research.
– Spaced out the Church pews.
– Added ladder to Apartments and altered the surrounding area.
– Allowed access to Apartments balconies.
– Fixed see through walls on top of Apartments.
– Fixed small section of terrain causing damage at Lava Pit.
– Fixed many stuck spots and minor bugs (thanks chocolates & fearless).
Rumor has it:
- WYS above IWYG for the most part, but localization files have also been updated
- Over a dozen languages' csgo_*.txt files have been optimized and will take up roughly 50% less disk space (these are: Danish, Dutch, Greek, Hungarian, Italian, Korean, Latin American Spanish, Norwegian, Russian, Spanish, Swedish, Simplified/Traditional Chinese, Thai, Turkish, and Vietnamese)
- Others (Brazilian, Bulgarian, Czech, German, Polish, Portuguese, and Romanian) only have new and updated translations, which are made possible with the help of Translators Like You - Thank You
- Size is ~200 MB