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The main thing I would like to see is a bigger display. It's a bit of a balancing act to maximize screen size without increasing overall device size to the point it becomes awkward to carry with you. I'm thinking of the Galaxy Tab - great size when you are sitting at your desk, not so great when you try to put it in your pocket, unless you are still rocking the MC Hammer pants.
One other thing I would like to see is an easily removable/replaceable battery. Not a huge deal, and I don't expect to see the change, but it would be nice.