If that ends up true, hey, that's a nice coup for Microsoft. They need a big announcement like that, wonder if the Jet Set Radio remake also gets revealed there.
But it also makes me think for sure then Sony has marketing rights on Persona 6 at the very least. Would be interesting in any case, Sony with Persona 6 and Microsoft with Persona 3 Remake. Given Sega's "strategic partnership" with the Azure team this is one of those perks I felt would end up dripping over to the Xbox side of things.
Also won't be surprised if each game is timed exclusive to their respective platforms, either.
I think what they're doing is Persona 6 exclusive (at least timed) to PS5 and Persona 3 Remake having marketing rights with Xbox in some way. Dunno if P3R would be a timed exclusive to Xbox but this is Atlus, SMT5 is still exclusive to the Switch after all :/.
For now I'd probably just accept the scenario that PS5 is getting P6 as a timed exclusive, PS5 & Xbox Series getting P3R but Microsoft probably snagging a Game Pass deal for P3R and possibly marketing rights outside of Japan & Asia (Sony would probably get marketing rights in those territories because of common sense).
I'd be surprised if MS in any way got P3R as a timed exclusive and if so that would probably kill a lot of the hype for the game outside of America. That's just me looking into the reality that JRPGs don't have a big audience on Xbox, especially smaller (in comparison to FF and Dragon Quest) franchises like Persona. But anything could happen I suppose.