Since the next gen will most likely be released on the successor to the DS, hardware that will undoubtedly have 3D rendering power at least on par with the N64, I can imagine having the functionality to design various aspects of the player character from their face to their clothes, to perhaps even their height and build.
Umm I thought they announced that it will be for this generations DS(DS,DS Lite,DSi,DSi XL).
I'll believe that once I actually see a trailer or screenshots from the game. I hate to be the cynic, but they've only just revealed Zorua and Zoroark, if they release the game at the end of the year, it'd be the fastest it's been to develop a pokemon game ever.
Especially so considering that there was a three-year gap between Munchlax's revelation and D/P's release, the two years between Kecleon's reveal and R/S's release.
It's weird why Game Freak haven't thought of this. :O
I like the idea. I could customize my character to make it have cool looking clothes! I could also change the female looks a bit. :D