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There are a bunch of form-factor rumors. Some say the case is a millimeter or so thicker. Some say the bevel is smaller. Some say there's a bit of a swoop in the case design (this could simply be a rehash of the iPhone 5 rumors).
The Magic 8 Ball: The Magic 8 Ball reads, "Better not tell you now". It would be a shame if Apple changed the form-factor with all the nice add-ons that support the current design, but Apple's screwed its aftermarket before, many times.
Image: Venture Beat reports that the iPad 3 will be slightly thicker than the iPad 2.