So, Pokemon Black and White 2? Not Grey? What a twist!
I think this is another way of Trollfreak trying to rake in the cash. Hardcore fans will be forced to buy four games rather than 3.
But...these appear to be more like sequels than a generic third game. The third game in the Pokemon main series is mostly just the same thing as the first two, with new stuff added. For example, Ruby and Sapphire were the first two main series games of Generation 3. Emerald was the third game, and the only real improvements it made was a Battle Frontier, the ability to rebattle Gym Leaders, a swap of Pokemon League Champions as well as the 8th Gym leader. Both Team Magma and Team Aqua were villains as well. And some other stuff. But the story was more of a retelling than anything.
But the "2" part of the names make me think that these may actually be sequel. Like, maybe they take place after the events of Black/White. Maybe they have something to do with
Spoiler Alert!N's disappearance at the end of B/W?
Obviously these new games will involve Kyurem more, and I wonder how. Judging by what appears to be a fusion of Kyurem and Reshiram, as well as Kyurem and Zekrom. This thread goes into more detail on Kyurem's new forms.