I think SaGa Frontier coming next is more likely a la FFVII-IX RD (I assume IX, if not X as well, are on their way).
Seeing how they did Romancing SaGa on its own, I think if we get a Seiken line, it's probably on its own or coupled with the old arrange album.
Also, I knew not to expect otherwise, but it would've been great if they could have updated the localization on this one. I can overlook FFV and RS2 but... yeah, RS3's OSV translation is real bad.