It's sad that they give a KH game that kind of treatment. CoM suffered from the same fate, it was almost a side project to gain more funds for KH2, even though CoM being a fantastic game.
I don't think KH3 will be PS3 only, that's not S-E policy for HD consoles at the moment, except for FFVXIII. It's more likely to be a PS3/360 game, or a wii only game.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
