No doubt, it would be fun to have one, however last week I completed my 4th track day on my R12S and am not sure I really need the HP Sport since I'm 46 and don't race or plan to.
If I got the bike, would I be that much better on the track? I don't think so. I outride guys on more powerful bikes all the time, and have been shamed by some darn good riders on GS's. I'm not sure I need to go that much faster than what my R12S is capable of. So for me, I'll pass on it...for now...since its not available...yet...but then again, by the time it comes out, I bet I'm first in line to buy it.