To clarify, September 15 will be our open-source developer release. At that time, we will open up our github repository, publish our roadmap, and shift our development style to be more community oriented. We intend on launching a consumer facing alpha in October.
http://www.joindiaspora.com/2010/08/26/overdue-update.html
It'll happen: http://twitter.com/joindiaspora/status/24509854745