2K Elizabeth has said it is currently working on three patches for Bioshock 2, one for each of the game's platforms.
The list of fixes for the game is extensive, with the PS3 and Xbox 360 patch addressing issues such as "fixing MP freezing and connectivity issues." There are a few fixes to the single-player mode, however it's mainly the online lobbies concentrated upon.
The PC version is in for the most treatment, however, with a huge list of items being patched. Issues being addressed include "fixing MP freezing and connectivity issues," "fixing various localization bugs for Multiplayer," and "Implementing color-blind friendly hacking UI."
You can read all the patch details here.