Erhm, yes. On the neopwn.com front page. In the same post (or the one before) as the video teasers, it was indicated that a "a beta release of the first BackTrack Mobile operating system for the Nokia N900 [...] will be public shortly BEFORE the Blackhat and Defcon conferences in July 2010". This has now been conveniently removed from any of the posts -- shame that Google cache remembers.
The public beta will essentially have nothing of "real use to you" due to the fact that you seem to only want access to the patched wl12xx driver. Also, "shortly after" BH and DC doesn't mean before or during - which is what most people in this thread assumed, eluded to and then *****ed when no announcement was made within ONE day of BH starting.