I think I'd like it to an action RPG like Zelda. I would like it to be a bit less bright and a bit more dark and mysterious. Maybe the whole of Dreamland has been turned to shadows or something.
I'd like Kirby to make an appearance but Kirby should be locked up or something and Meta Knight has to save him.
I was all for getting a bit dark with the Kirby games as well but I think that it would rule out too much of the fans who liked the Kirby games for how they are. I do like the idea of Meta Knight saving Kirby though.