According to publisher Activision, the 39mb download includes the following changes:
- Fixed an exploit that allowed players to access certain console dvars during multi-player matches.
- Fixed a crash that could occur when a Chinatown Sabotage match would go into over-time.
- Fixed a bug where the MP icons (Bomb, Defend, Capture, etc) were always showing up as English regardless of the install language.
I just ask to not take forever to update the Steam version.
Steam version has it now also.