On the one hand, yay! Persona 3, in particular, was last released on the PSP in 2009, and so hasn't been readily accessible to play on a modern system for quite a while. That it can finally be played on modern hardware is definitely a good thing. And a Persona 5 release on PC seemed like a no-brainer.
On the other hand, the dream of an official, definitive version of Persona 3 that marries the content of FES and Portable appears to be dead. They are quite pointedly calling it "Persona 3 Portable" rather than simply "Persona 3," or "Persona 3: Definitive" or similar.
I guess my hope now is that after it comes to PC some fan will mod in the missing 3d social environments from FES (I can live without The Answer). But it doesn't seem likely to happen, as that would not be a simple mod. *sigh*