Since we're on the subject, what I would be so excited about is if you could be any pokemon in a mystery dungeon game... I mean, they made walking sprites for EVERY pokemon already for hgss so its not like they'd have to do much work.
... Anyway, what I'm worried about is new legendaries. I mean, making Arcerus the "God Pokemon" what can you go off from from there? I'm guessing they'll figure something out but it's iffy. For names I think they would stop doing minerals and name their games like any other game. I mean, they kinda cornered themselves with platinum... so it wouldn't seem better.
What I really want is this: New region with new pokemon AND the ability to go back into ALL the regions. I dunno if I'm alone, but for me the whole "National Dex" thing is the stupidest thing ever.