New Pokémon Game to Be Revealed Next Month

CoroCoro magazine announced that in next month's issue (January 14, 2012) a new Pokémon game will be revealed. Is it going to be the speculated Pokémon Grey? Main series? Spin-off? PokéPark 3 somehow?

All I know is I want an expansive Pokemon Wii U game, and I want it now!