A recent leak has revealed that two forgotten PlayStation 2 exclusives, Devil Summoner: Raidou Kuzunoha vs. the Soulless Army and its sequel Devil Summoner 2: Raidou Kuzunoha vs. King Abaddon, are potentially making a return. These games, part of the larger Megami Tensei franchise, were originally released between 2006 and 2008 and have remained exclusive to the PS2, although they were later made available on the PS3 as emulated versions.
Iirc, the leak was from steam achievements being posted to another game and that sort of tipped people off. Seems like a pretty dumb mistake, if it really is a mistake anyway.