it'll probably be like, the return of ultimecia with a time loop thingy.
ffviii:edea gives powers to rinoa, adel gives powers to rinoa, seeds beat ultimecia, ultimecia gives powers to edea,
ffviii-2: edea gives powers to rinoa, rinoa gives powers to some other people and eventually it gets back to ultimecia. seeds kill rinoa, the last sorceress, so no more can ever exist.