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from what i remember doesn't the iPad's battery take up the majority fo the space in the iPad? the 10 hour length of said battery has also been a main feature Stevey boy likes to let everyone know about so unless they could reduce the size of the battery without affecting the length of run time i doubt we'll be seeing a smaller iPad.

At some point batteries won't even be necessary with advancements in piezoelectricity, swiping your finger on the iPad screen will generate a certain amount of voltage which will ultimately recharge your iPad. Then there's inductive charging which might come first. Both of these technologies will be available in the future, the question is how soon.

Anyway, sorry if I got off topic here, but when you mentioned batteries it made me think of this, now back to 2011 I come.
 
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