By checking FF 13,13-2 and 13-3 performance on X360, we can notice that even in the one territory where 360 had a much higher base (US), it sold less than it's ps3 counterparts. European numbers were MUCH higher on ps3 and japanese numbers were practically nonexistent for the 360. regarding FF 13-3, even europe was almost nonexistent too. 13-3 is also at only 200k WW and will be a long run untill it even reaches 300k.
The point is that the audience of nintendo consoles have a bigger acceptance regarding jrpgs, meaning a wii u version of FF 15 and KH3 should easily outsell an Xone version in the same way it happens on playstation: the US numbers would be at least on par, EU would be quite above and japan wouldn't even be a competition.
On another perspective, vgc US preorders have FF15 with 28k on ps4 and 9.5k on Xone. Wii U titles of smaller franchises had and are having a better performance than that.
KH was never on xbox but it already established a fanbase on nintendo platforms, meaning a similar proportion should occur on Wii U vs Xone.
Basically, it makes sub zero sense to release said games on Xone and not on Wii U. even though i think at least KH3 will get confirmed, it's stupid not to confirm it along the other versions.
