Today, Bioshock 2 was migrated to Steamworks. All keys, retail and digital, can now be activated on Steam. The Steam version no longer uses Games for Windows Live or SecuROM DRM.
The update includes new multiplayer changes, Xbox 360 Controller support, Steam achievements, and removal of GFWL. GFWL saves and achievements do not transfer to the new version.
The Steam version includes the DLCs. Anyone who activates an existing key will get Minerva's Den for free; future keys or Steam purchases will not include Minerva's Den. Minerva's Den is now available on Steam for $9.99 USD.