Hmm, guess we'll have to wait for David Hewlett to spin the beans. I went and asked Craig Engler of SyFy what the movie was, and got back this response. Darn.
@Syfy Q) @wraithfodder Question: What movie is @dhewlett making for Syfy? Really curious! A) I don't think we've announced that one yet.
UPDATE: Feb 21 - found this on my twitter stream...
SyfyMovies Follow SG Atlantis David Hewlett (@dhewlett) as he directs a Syfy original movie in Bulgaria! Go David!