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So the old smart covers will work? Both the same? How about cases?

The Smart Covers will work just fine. Infact the ones you can order together with the new iPad are exactly the same ones that are sold for the iPad 2. As for cases it's hard to say as the new iPad is a few mm thicker. I've got a Vaja leather sleeve case and I'm hoping it fits as it was fairly expensive.
 
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