We originally planned the end of January. A bugfix release (4.1.2) for JFBConnect and Joomla 2.5's release, which required a lot of testing, pushed that back. We are working on it right now and are shooting to have something available by the end of this weekend.
We apologize for the delay, but are pretty excited with what we see of VirtueMart 2.0 so far!
Thanks,
Alex