Via CS:GO Blog:

MAPS

Biome:

• Fixed boost with visibility glitch on A long.
• Added more crates at B boost.
• Widened mid.
• CT side of mid now splits into upper and lower.
• Redesigned connector at top of mid – now “vent”.
• Opened a window above mid, allowing nades.
• Lowered skybox and added visual cues for nading.
• Removed path between T spawn and catwalk.
• Cut the sightline between A short and outside.
• New crate on B allows jumping from site to heaven.
• Fixed various minor bugs.

###Subzero:

• Redesigned A Connector.
• Removed Door on B which mostly benefited T’s.
• Removed crates in A Pit which mostly benefited T’s.
• Fixed water in spawns eating guns.