Obviously the 3DS can't run this game, but Square-Enix in Japan is now offering games like DQX on 3DS and Final Fantasy XIII on smartphones in Japan via cloud streaming (so the system itself doesn't have to run the game). So theoretically they could put FFXV on the 3DS in Japan, especially now that n3DS models have a a second analog stick.
Since 3DS is going to be the only platform in Japan with a userbase well over 10 million any time in the near future, maybe this wouldn't be a bad play for Square-Enix.
It would make more sense than releasing a XBox One version there (if they were still planning to do that). For the first time in 10+ years the main Final Fantasy could actually be on Japan's no.1 gaming platform. Perhaps that can help with the FF's series' recent declining sales in Japan.
