My two cents about this.
Some huge amounts of money have to be coming from MS & Sony so the game are not ported to PS3/360...it is a bad economic policy not to sell those game on a large, very large install base. This games cost lost of money to produce...my guess is that the actual game will not be great graphical jump....only the cgi will be awesome but the actual game engine...I don't think so.
It could also happen that, as we have seen with games made for Vita and 3DS, back in the shadows the devs already know that they will eventually port the games to other platforms, but, they will originally will develop the games in the next gen console engines. So they keep this ideas quiet till launching date and later they release the ports.
As I said, there is simple too much money to be made in the old gen....and if the game goes old gen, the WiiU still has a chance.