Assassin's Creed: Rising Phoenix is a PlayStation Vita game, according to a listing by Spanish retailer XtraLife.
The retailer dates the game for release on October 10, 2013, three weeks before Assassin's Creed 4: Black Flag goes on sale on other formats.
Ubisoft has yet to announce Assassin's Creed: Rising Phoenix, or even confirm that a second Assassin's Creed game is heading to PlayStation Vita.
A logo for the unannounced title first leaked online last week via an internal Ubisoft slide, prompting speculation that Rising Phoenix could be a Vita title or movie.
Ubisoft gave VideoGamer.com a "no comment" when contacted about the listing this morning.