Update (1 March): Nintendo of America has issued an official press release, stating that Pokemon Black 2 and Pokemon White 2 will be released in North America in “Fall 2012”.
Original: Pokemon Black 2 and Pokemon White 2 have been announced for the Nintendo DS. The two separate titles are the respective, direct sequels to the original Pokemon Black and Pokemon White. The game will be released in Japan this June.
No further information about new Pokemon or battle-system changes have been revealed yet, apart from the teaser image for Black 2 and White 2.
The official US Pokemon website states that more details about the sequels will be revealed “throughout the year”, suggesting that an English translated version of both games are currently in the works. No release date has been given yet for the English versions.