Classic Square RPG Final Fantasy VI is getting a PlayStation Network re-release in Japan this month.
It will be the 1999 PSone version of the game, rather than the 1994 SNES original. That now just leaves Final Fantasy IV as the only PSone franchise outing yet to be ported over to PSN.
No Western release dates have been confirmed yet. While you're waiting, why not reacquaint yourself with Final Fantasy V, which arrived on the service earlier this week.