Well, sorry for double posting, but talking with friends has led to some interesting speculations. Do keep in mind that everything I'm about to say is pure speculation, and not in any way confirmed content.
If one looks closely at the game logos in the above picture, something rather interesting becomes apparent. Namely, the logo for Black 2 includes a sapphire, and the logo for White 2 includes a ruby. There is absolutely no way that is a coincidence, considering trends suggest that 5th generation would see remakes of the 3rd generation games. However, 5th generation has been largely about breaking established rules and expectations--the fact that the "third game" is actually two games is a continuation of the generation breaking molds. This has led us to believe that it's possible that B&W2 will include the Hoenn region in some way.
It also lends some credence to the theory that the games will be more truly "sequels" to the original B&W games, coupled with another interesting fact. Namely, that Black Kyurem is the mascot of Black 2, and White Kyurem is the mascot of White 2. Anyone familiar with B&W will recognize that in Black, Zekrom was owned by N and never available to the player--yet in Black 2, you will be able to get a Kyurem somehow linked with Zekrom's power. The same is true for Reshiram in White.
While, again, this is pure speculation, that one picture gives an awful lot to think about.
