So we all know why this game is coming to the Wii U.
1) It's Kirby, so it had to happen sometime soon as Kirby games for handheld and console usually release close together then take a break.
2) They needed games that used the Gamepad's touchscreen.
I didn't play the original DS title that inspired this control mech, but I don't think it fits the Wii U that well as it would on a handheld. I think they should've done something like Kirby 64: The Crystal Shards, well mostly because I want the comining powers back, but I think they could do something similiar to Hyper Nova. Like have shards to make a special power, there will be a power for each world. Those powers are needed to complete the world. You can combine powers on the gamepad, also to make the special power you have to put it together like a puzzle.
Just a quick idea I got while playing through The Crystal Shards earlier so its a big rough. Bit more minimal impact on the gamepad, but I think it works. The gamepad should enhance or spice up the gameplay a little bit, not be the complete focus.