The DS will receive not one, but two sequels in Japan later this year.
http://www.nintendoworldreport.com/news/29394
Two sequels to Pokémon Black and White have been revealed, titled Pocket Monsters Black 2 and Pocket Monsters White 2, as revealed on the latest episode of Pokémon Smash.
The announcement was made in the last few minutes of the show as Pokémon director Junichi Masuda appeared on the show to reveal two new forms of Kyurem (appearing to be fusions of Kyurem and the two mascot Pokémon, Reshiram and Zekrom), and the titles of the two games. The games will appear on the Nintendo DS and are set for a June release in Japan. The games are also noted to be playable "in 2D on the Nintendo 3DS," though the extent of any extra features remains unknown.
Masuda also revealed the official website for the titles on Twitter soon after the episode. On the North American website, the game has also been revealed as "coming soon." The localized versions will be called "Pokémon White Version 2" and "Pokémon Black Version 2."
Masuda later revealed that the two forms are in fact new legendary Pokémon, and the developer tweeted (in English) that their names are Black Kyurem and White Kyurem.
The fact that it's not a 3DS release means I have pretty much zero interest in this.Seconded.
The games are also noted to be playable "in 2D on the Nintendo 3DS,"
Updated the article again. The forms are unique Pokemon now.
"You mean like every other DS game?"
Yes, but what if the game has 3DS enhancements?
...There ya go. It might be petty but its part of the reason I haven't been able to really get into any of the GBA on games.
2D sprite game Even the battles.
...
To those saying they won't buy it or have no interest because it's a DS game (even though you can play it on your 3DS), why? Did you play Pokémon Crystal? In North America it came out after the Game Boy Advance launched. I am sure the proper sequels (i.e. not just expanded versions) will be on 3DS.
The English subtitle of "Version 2" indicated to me that the game will be a great big content patch or expansion pack like the other third versions of Pokemon generations. However, the Japanese title is just a plain "2" which indicates a narrative or full sequel of Black & White or something in the ball park of Final Fantasy X-2 & XIII-2; that sounds quite exciting.
And from a business perspective I get why they'd want to wait so the massive upswing of 3DS sales that would come from the first real 3DS Pokemon game happens when they're not taking a loss on the hardware.