I know nobody cares, but I figured I’d hop on the hypewagon and write down my guess for the Apple tablet. I think a “big iPod Touch” would be pretty boring, and not worth making. My guess (based on nothing): the unit will be controlled by eye tracking, and it’ll be able to zoom in on whatever you’re looking at.
That is all.
Evan Hoffman's Blog 
I was wrong. And it is, apparently, just a big iPod touch. Boring.