I'd imagine a Persona 2 remake would be a full on re-imagination, I don't see Atlus splitting that into two again, and that would likely already give you an entirely new game, even if they stick true to the structure of the Persona 2, which was a much more traditional JRPG dungeon crawler in the vein of old SMT titles. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.