On April 16, it was discovered, via NeoGAF, that retailer Best Buy’s online website lists a description for Persona 4 Arena Ultimax that lists a release date as well as two new fighters: Ken Amada from Persona 3 and Rise Kujikawa from Persona 4.
Best Buy’s description states:
Select one of six new characters — including Persona 3 favorites Yukari Takeba, Junpei Iori and Ken Amada, Persona 4 Arena NPC Rise Kujikawa and Sho Minazuki and his Persona-wielding doppelganger
Neither character has been confirmed for the game as of yet. The website listing also states the North American release date to be September 16, 2014.