According to Famitsu, the main character from Final Fantasy Tactics A2 (the DS sequel to FF Tactics Advance) is going to make an appeareance in the PSP remake of Tactics, Final Fantasy Tactics: Shisho Sensou. This new character, Russo (or possibly Luso or something similar, depending on how it's localized in English), encounters and takes on Ramza while he's on the way to rescuing Alma; it isn't clear exactly where in the game this takes place.
This marks the second character from a recent FF game announced to have a supporting role in the FF Tactics remake, after Balthier from FF XII was announced as playable a few months ago. Is Square-Enix taking this cross-promotion a bit too far, or do we want even more? Depends on the person, I guess.
Source:
RPGFan