I think/hope for new types. As it would make sense for the Y pokemon (forgot its name) to be sound/flying sound/dragon etc.
And for the X pokemon (its a hard name) To be light/ground light/normal etc. well I guess we have to wait and see.
And I think if theres a new type, sylveon would be it, like why would they make some eeveeloutions type so secret, and if it looks like a real pokemon type they've already done it for eevee, like normal and pshyic.
I want maybe if they have to some new abilities? New moves? New items. I highly think this wont happen but I want it to happen is WALK WITH YOUR POKEMON like in HG/SS because that rocked!
I want it to happen too, but it should be different. You should be able to choose your walking partner, and it should not matter if that pokemon is the first in your party list or not.
I would like to be able to begin with a pokemon that isn't one of the starters. Maybe if you show up at the professor's lab too late, you would have to do a side quest to find a different pokemon but not every one should be available for this, like those who are a legendary or a starter, and previous generations should be included. I think the move list of some pokemon will need to be updated, so everyone begins with a damage dealing attack.