Zekkyou on 25 April 2017
It's not outside the realm of possibility, but i'm sceptical that it'd be a particularly good port. The gap between the PS4 and a portable-mode Switch is huge, and from what we've seen the game is making pretty good use of the PS4's hardware. I wouldn't be shocked if it ended up being sub-1080p on the PS4 like FF15. UE4 makes scaling a lot easier than if they were still using Luminous, but they'd have to be very aggressive about it.
