on KH1 there was a secret video showing kh2 which was a ps2 exclusive and not chain of memories which was a GBA exclusive
on KH2 final mix there was a video showing bith by sleep which is a psp exclusive and not KH:358/2 days which was on DS
on KH BBS secret will show KH3 on ps3 , why ? becuse you can 't promote a game which is on a different brand(example Wii)
if kh3 is on the wii there should be a secret 358/2 days(ds game) showing it since it is nintendo system