i would not really say power because there the same size as phones, so I'm guessing they won't be much beefer.
I'm guessing the only real difference is no calling, like the iPad for example, is just a gaint iTouch without calls and camera.
So vise-versa (android, windows mobile,linux,ect), but it seems a little pointless that if you did make them the realitivly same size as a phone you would take out just calling and call it a mini-tablet, which then I'm guessing would mean there cheap then smartphones.
(sorry for the huge amount of spelling errors)