here's another one, the Ducati 1098. While not as ultra exotic as the F4CC, it comes pretty close.
Pix from Gizmag article <http://www.gizmag.com/go/6460>
I agree, I don't think that it'll be a tourbillon either. Not just because of the price tag, but also because of the inherent durability concerns associated with riding a bike, and wearing a delicate watch. Besides, I'm betting that it'll be this one: GP Laureato EVO3 (Ti?)
Pix from girard-perregaux.ch
I'll be interesting to see how GP translates the characteristics of the ultra performance bike into watch form.