Sequels due for release in Japan in June.
The next titles in the main Pokemon series will be released in Japan this June, Nintendo has announced - a European launch will follow in the autumn. Pokemon Black and White 2 are DS, rather than 3DS titles, although you can obviously play both on the 3DS due to its backwards compatibility with the DS.
Previous Pokemon games have seen a third game, but this is the first time we've seen two sequels. As expected, each game will feature a brand new legendary monster: Black Kyurem in Pokemon Black 2 and White Kyurem in Pokemon White 2.