I'm not as keen on this using P3 and P4 characters again for P5 idea that y'all seem to be. I'd much rather a new location with a new set of characters. I've already spent about two hundred plus hours with the likes of Chie and Mitsuru. Bring on an entire new cast. I haven't played P4A yet though, maybe that'll change my opinion.
Thank god for some Persona 5 news, though. Still can't see us getting it until 2014, but it's nice to hear something.
I've only just started playing, about 2 or 3 hours in, but I'm enjoying a pistol/shotgun combo. Pistol while I'm being stealthy, then the shotgun for when the shit hits the fan. The shotgun is so powerful at close range, you only need to find somewhere to camp out and wait for the alerted enemies to come your way and the bodies will start to pile up. I haven't even put a point into shotguns yet (or much else for that matter, playing on Recruit), but it's still super useful for when you're forced into combat.
So from the little I've played, going for the stealth/pistol/shotgun route appears to be pretty effective. I'm actually quite enjoying the combat, but it's still more satisfying to clear a room with neck snapping.