Holy heartboobs! Platform details from the ESRB listing for Persona 2: Eternal Punishment solves the mystery from yesterday. With both PS3 and PSP listed as platforms, it looks like this other Persona 2 release will be a PlayStation Network title, and not a PSP title.
The ESRB rates Persona 2: Eternal Punishment 'O' for Overdue.
Expect to see an announcement for this title very soon. Sell your super rare hard copies of the PS1 game while you can!