Via Andriasang, we have word from Famitsu scans about some future Atlus plans.
First is that similar to P3P there will be a remake of Persona 4 for a handheld, though for the Vita this time. Renamed Persona: Golden, we can expect a new character named Mary, some online capabilities (being able to ask friends for help if you're about to perish in dungeons), as well as other bits and bobs here and there. This particular game caught the eye of some gay gamers due to the exploration of Kanji presented.
We don't have a firm release date for the Vita on PAL or US shores, so the fact that this is set to release in Spring 2012 may well make it a 'launch window' type title that may well entice some fans.
Further, there appears to be a title coming to us called The Ultimate In Mayonaka Arena: a fighting game for home consoles featuring characters from Personas 3 & 4. The devs behind this particular game? Arc System Works, of Guilty Gear and BlazBlue fame. Apparently this will take a few months after the events of Persona 4 and feature a story of some manner, but not too many more details.
Also, Persona 5? In the works, but beyond that, Andriasang had little else more to say beyond the staff involved.