I don't understand why people care so much about thickness, it doesn't have any real effect on usability. But whatever.
If they dropped an 11.3" matte display (1440x900 please) portable the size of a 12", with USB, FireWire, a quick-swappable battery (or fine: Seal the damned thing in, but I want a real-world 12 hours of battery if you're going to do it), and a 2.5" HDD, I'd even break my "No Rev A" rule and buy the first one I could get my hands on.*
* I'd reserve the right to renege if Apple did something immensely stupid, like make it not have a physical keyboard, or make it use an Atom or otherwise worthless processor, etc etc.