A recent post on the Japanese "FF7 Blog" has hinted at a Final Fantasy XII side story making an appearance on the Nintendo DS. Don't get your hopes up yet, though--there's no credible information backing this up, and it should be considered nothing more than a rumor at this point. However, the same site commented early on about the existence of Chocobo & the Magic Picturebook and Dragon Quest Monsters: Joker, lending at least a slight bit of credence to the post.
The same news post also mentions Kingdom Hearts II: Final Mix, which is, more than likely, a Japanese-exclusive update to the original game with various extras and enhancements, much like the first Kingdom Hearts: Final Mix.
Remember to take this info with a grain of salt, as it could be little more than speculation right now. More to come as it breaks.
[Sources: C3 News, TVG]
EoFF on Twitter