First Kirby 3DS game is called Kirby: Triple Deluxe
Buried in the Nintendo Direct presentation announcements yesterday was the full title for the new Kirby 3DS game. It's called Kirby: Triple Deluxe (see what they did there?).
Nintendo said in a press release that it will have more information to announce "in the future," so we don't know too much other than it's due for launch next year.
From what I can tell, it looks like a typical side-scrolling Kirby platforming game, only with 3D effects that build out environments and give them more depth — the train in the teaser video below looks pretty cool.