Yeh, this was strongly rumored when a Denuvo page for it leaked. Always a good thing when a good game on an unpopular platform gets a second chance, giving more people a crack at it. The was also another rumour that Persona 3 would also make the jump. Seems P4G is doing well too. It's currently on the top seller page.
Here's to hoping that'll convince Atlus to port more games to other systems. They've oftentimes asked the community whether it wants ports to platforms other than the one that franchise is associated with, but this is afaik the first time they've actually done so (aside from Tokyo Mirage Sessions, but that's still Nintendo → Nintendo). C'mon, gimme Persona 5 Royal.