Unfortunately, people don't check the Site Projects section as much as they probably should (especially when they're actually part of a project). I've found that taking the passive approach and hoping people will come to you doesn't work very often; it's much better to be active and initiate contact with everyone involved. That way, you know what's up, and you can make sure people remember if they don't make their way to this section of the forums for a long time.
I try to contact the artists when I can, but that is more of KWarps part. I got in touch in SOME, but the results weren't all that pleasing.