Via the Steam Community:

MISC

• Fixed a bug where grenade throw animations would get stuck when switching hands.
• Fixed a bug where the same grenade type couldn't be thrown multiple times without switching to another weapon first.
• Fixed a bug that allowed picking up grenades beyond the normal maximum.
• Fixed a bug where smoke grenades would sometimes appear lit as if a flashbang detonated inside them.

MAPS

• Fixed a spot in Dust 2 above mid doors where grenades would fall through the world.
• Fixed a spot in Inferno where weapons could fall through the world.

Rumor has it:

• Size is ~650 MB (with Workshop Tools installed) – data capped users should be aware