thisis just be speculation but its possible this could be coming out as FFXV, it's been in development for around 6 years now, perhaps the video Agni's Philosophy, which is a show case for their engine on next gen consoles is an indicator they may want to push versus to the next gen console?

@armandoisgreat they released the song "Somnus" its been out for a good 4 years now, better use it for Theatrhythm than leave it as a youtube relic of the past