Is 'up my sleeve' also a hint about where the pointing-device interfaces with the body?
I was really hopeful that the Leap Motion was going to be 'the right thing', but I'm pretty sure that anything that requires you to move your wrist to use is going to be a lose.
I'm not 100% sure we're going to get a pointing device into the v1 product. I'd rather ship a good keyboard than not ship a better keyboard.
I'm a big fan of Thinkpad keyboards and have a few USB versions, but finally switched to mechanical keyboards 6 months ago. I still miss the Trackpoint daily though...