In the 2.8 announcement trailer, 2.8 was only announced for the PlayStation 4. It would be a bit weird if Square Enix only released the official prologue game for Kingdom Hearts 3 on the PlayStation 4 only, since Kingdom Hearts 3 is coming out on the Xbox One as well. I think that 2.8 will be confirmed for the Xbox One at a later date, like what Square did for KH3. It doesn't really affect me because I won't play either game on an Xbox One, but Square shouldn't forget about the Xbox fans.
What do you guys all think?