I think that Sony only has timed exclusivity at best. The earlier trailers all said "First on PS4", but the latest was missing that, so they may have even lost the timed, after FFXV and KH3 performed pretty well on XB1. I think that the plan is for 3 episodes, the first will be a cross-gen release Holiday 2020 most likely, on PS4, XB1, PS5, and Xbox Scarlett. Episodes 2 and 3 will be next-gen only I suspect, they won't be releasing games on PS4/XB1 in like 2022-2024. I think I read that the plan is for each episode to be treated as a standalone game, with new side content being added to fill each episode out. There was talk of adding some content from spinoffs in the FF7 compilation as well.