Yes the remaining 3-miles of unpaved surface are supposed to be paved by June 2012. I expect many of the records will fall. We shall see if, like you suggest, other brands get in on the climb. To me it seems like an ultimate challenge for a roadbike, and I'd like to see someone try with an Aprilia V4 next year.
Last I heard there was only .7 miles that remained unpaved as of last Sept. (2011). Might even be more now - will check it out when I have a chance. Weather permitting, might be soon.