After some teasing from GameFreak's Junnichi Masuda, the first ever sequel in the main Pokemon franchise, Black and White 2, has been announced.
Not much else was revealed, other than new forms for Black and White's exclusive legendary, Kyurem, representing its fellow legendaries Zekram and Reshiram (as seen above). Other than that, there's been no word on whether these are direct sequels or extensive modifications to the original games in the veins of Pokemon Yellow, Crystal, Emerald, and so on. Both games are also coming to the DS exclusively.
The games are to be released in Japan in June, with a North American release "coming soon".