The key shapes for the TI-82 are also rounded. This looks completely weird to me. And now, TI will have two very, very similar models to sell. They are VERY different. For one, the 83 has built in assembly where the 82 doesn't.
Assembly is assembly is assembly when using the same proccessors.
Looks like they just wanted to get rid of that old TI-82 case. I doubt it takes much effort to put the same calculator in a different case. I think the TI-83 is in that same case now too. A TI82 can fit Joltima AND still have room to spare. The redesign is pointless.