What a cool thread! We can have fun after all, right ;-)
I'm going to vote for the Koni-Omega (from my experience). I get asked A LOT of questions about that when its out. Of course, there are plenty others. The Blad Super Wide that was posted a few pages back, that is beyond sub zero cool.
As for Uncool MF camera's, I'd have to say the Bronica SQ, ETR and GS series. They are so much tradesman tools that they could never be cool