My guesses...
Greatly improved processor (if you remember the first iPad A4 teardown revealed a chip that was built it September 2009 - so they've had a lot of time to make huge improvements.
No 4G. Not until it's use is widespread and 4G chips become more efficient.
Improved battery.
Improved cameras.
32gb/64gb
New case design for the back is possible but I highly doubt it.
Larger screen - just enough to fill in the black top/bottom.. I think there is a pretty good chance.
Greatly improved processor (if you remember the first iPad A4 teardown revealed a chip that was built it September 2009 - so they've had a lot of time to make huge improvements.
No 4G. Not until it's use is widespread and 4G chips become more efficient.
Improved battery.
Improved cameras.
32gb/64gb
New case design for the back is possible but I highly doubt it.
Larger screen - just enough to fill in the black top/bottom.. I think there is a pretty good chance.