I was thinking about jumping ship from MBP to MP. Even if the 650M is fast, it is still going to be hot. The current MBP fan already winds up too much when playing and making the machine thinner won't help.
MP + MBA/iPad should be the ultimate setup.
I just HOPE (but i think it won't happen) that they leave the Optical Drive out and use the extra space for advanced cooling / more battery or both. Then there would be more possibilities.
In a perfect world (for me) there would be space for a second HDD or a second GPU. But well
Macbook Pro thinner? Don't care. More Power? Please yes.