One thing I would love to be mentioned. The over 700 new pokemon statement was a deterrence and there will actually be a total of 800 Pokemon in existence. Also that they release 3-4 new Pokemon and reveal not to announce anymore Pokemon until October 12th. I can't help but look and I don't want to.
I would like it if that red polka dot bird was just the braviary on this gen and not precious fletchlings 2nd evo. But if it is its 2nd evo I just really really really hope its final evo makes up for it by looking awesome and not wacky.
Difficulty modes, as well as the game's Nintendo Network features which will surely be awesome for the competitive scene.
Would hope for them to reveal a sort of New Game+ feature where you can start over but keep all your Pokemon. I'm happy that you can replay the game by save scumming the digital version but this would just be a whole lot more convenient and wouldn't potentially mess with StreetPass and SpotPass. I'd like a way to manipulate IVs but I doubt that is something they would be hyping up.