Take 2 Games has confirmed a release date for BioShock 2 for both North America and Europe.

Expect BioShock 2 to be at your pre-ordered doorstep on November 3, 2009 for North America residents and October 30, 2009 for all you European fans.
 
The release date reveal comes from a Q2 investor source, but Take 2 states that this date is “tentative”, so we’re taking that as an official release, of course.