We are shooting to have Chapter One of the single player campaign released before phase 3 of the Make Something Unreal competition, but the short answer is: when it's done. We don't have enough time in teh day to devote to this project, but having a few more talented people would help us get things done faster.
Our single player campaign is going to be roughly 50 MISSIONS, some of which will be multiple maps, and that is not including our multiplayer modes, so we still have a lot of work to do before there is a publicly downloadable and playable mod. I will be updating my journal every few days, however, so that is a good place to look for updates on progress.