Kingdom Hearts 1.5 ReMIX, is the most recent entry that will be soon to release for PS3. The game which contains KH1, Re:CoM and 358/2 Days, have judged the WiiU, for reasons unknown, though surely related to KH1, originally being only for PS2. Even though CoM was released for Gameboy Advance and 358/2 Days for DS. Seeing how this is the case, it is strange that the game is not coming to WiiU, specially since it can be handled by the power of the WiiU.
CoM and 358/2 Days coming out in Nintendo Consoles, is not the only reason why it should come out on WiiU. But it coming out on WiiU, would also be good for Square Enix, since they would be building more fanbase from WiiU owners. This would not only help to expand the series, but it would also give Square Enix a bigger revenue, in both money and people who are able to experience the game. The game could also take advantage from the WiiU gamepad, to hold the map, and the life gauges, though this would be something optional, so that the player can decide how they want to play it.
The WiiU also gives a arsenal of ways the player can play, be it the WiiU Gamepad, the WiiU Pro controller, which is very similar to the PS2/PS3 controller, only differences being instead of symbols, it being letters, and finally the Wii Controller with Nunchuck. Giving the game a good arsenal, from controllers to be played with, the majority having the same control scheme, except the normal controller, which could always be left aside, and only play with the similar WiiU Gamepad and Pro Controller.
The trophies would have to be changed to Achivements, or to something similar to what KH3D, Re:Coded and Birth By Sleep had. It would need a bit more of programming, but it could still be done. The same with the controllers, though it wouldn't be so troublesome, to add the programming to it.
The game would have to come a bit later than the PS3 version of it. But it would still be a good way to expand the fanbase, gain more money more Square Enix, and make the series reach to many other people, which would be the WiiU owners.
Kingdom Hearts 2.5 is also a possible entry to the series, after Kingdom Hearts 1.5. This game would hold Kingdom Hearts 2 FM, Kingdom Hearts Birth By Sleep FM, and Re:Coded(probably in cutscenes). The game would make a great entry to the WiiU library, and would fit quite well with WiiU's controllers and it would not be that hard to make them work and would only need a bit of changes from PS2/PS3/PS4 controllers. Many fans would also be pleased by receiving the possible Kingdom Hearts 2.5 ReMiX on WiiU, since some may have a PS3 and not a WiiU, and others may have a WiiU and not a PS3. Releasing the games on both console would be a good way for everyone to experience the game, and would boost the fanbase, and would bring some good income to Square Enix, and would surely gain more buyers for the future Kingdom Hearts 3, since more people who haven't played the series, will surely be interested and would buy it, and would also desire to get Kingdom Hearts 3 and Kingdom Hearts 1.5 ReMIX.