Wasn't expecting Atlus to have another 3DS project for this year in Japan. Gonna assume they also have that Vanillaware game coming this year (PS4), and maybe Etrian Odyssey 3 Untold. Gonna re-use that EOIV engine and take advantage of the dual-screens of the 3DS one last time.
Honestly, I'm not surprised. Atlus is not exactly estraneous to releasing games late in a console's lifecycle. We all know about Persona 4 in 2008, but even more recently: both Nora to Toki no Kōbō: Kiri no Mori no Majo (July 21st, 2011) and Devil Survivor 2 (July 28th, 2011) released on DS months after 3DS' release. Actually, Devil Survivor 2 came out before the Nintendo 3DS version of the first Devil Survivor (September 1st, 2011). And we shouldn't forget how Persona 5 was PS3-only at its first announcement, and still came out on PS3 last year (alongside its PS4 version). So yes, Atlus releasing more than SMT this year on 3DS is not such a shock.
I wonder what else Atlus is going to bring to 3DS this year (if there's anything else): a EOIII Untold is plausible, since they said EOV was going to be possibly the last
numbered EO on 3DS (I suppose remakes get a pass). Also, hopefully we see 13 Sentinels again this Sunday, as well as a Switch game for 2017. I wouldn't exclude a Persona spin-off of sorts (Persona 5: Arena? Persona 5: DAN? Persona Musou? ).