Only rumor we have that it's made by EPD, it's a 2D platformer and it's different from Country series. Could be something like Jungle Climber series or even a sequel to Jungle Beat. Not being another Country game is both interesting and disappointing, it could be something better or... could be Jungle Beat 2.
This fall should have 3 different 2D platformers from Nintendo: Metroid 5, DK and Kirby. Sounds like overkill but Nintendo loves 2D as much as we love 3D platformers.
If those three platformers are ready then Kirby will almost certainly be kept for Q1 next year.