Koei Tecmo Europe updated their Twitter status today with a rather cryptic tweet concerning Ar Nosurge Plus:
Another announcement coming soon. 👭🎶➕ #KTfamily
— KOEI TECMO EUROPE (@koeitecmoeurope) May 5, 2015
As pointed out by NeoGAF user Shizuka, “the game features two pair of characters you control, it’s related to the Ar Tonelico games (in which they use hymns to fight) and there is a plus in the end of the message.”
In other words, all signs point to a big announcement for Ar Nosurge Plus, and seeing as how it was Koei Tecmo Europe that posted it, it’s most likely is related to a localization (fingers crossed on that happening from my end).