The original plan was to get something quasi-functional out by the time Whidbey beta 2 was out, but I don't think that's going to happen. I'm not content with the way things are in terms of features and architecture. I don't want to just hash out a Whidbey-ized v7.x, so I'll take some time with it. Perhaps I can get it done in time for the RTM.
Someone asked why I don't just open it up as a collaborative effort. There are two reasons. First is that the forum continues to be my lab and my education. This thing has been with me now in one form or another for six years. The second thing is that it must meet my needs first. It currently serves as the basis for nearly all of my sites and various projects I've worked on in the last few years.