So Project X Zone 2 was mentioned as one of Namco Bandai's upcoming games in an Italian article that went up too early and was later removed:
The highlighted game, Saints Seya Soldiers' Soul, was announced after the article was taken down, so it sounds like Project X Zone 2 is coming as well for the 3DS. Apparently Namco Bando held a press conference at an event in Italy, which is where this comes from.