In August 2012, Kotaku reported a rumor about a game that looked to be a Prince of Persia reboot based on coding in a leaked photo (see below).
In the rumor by Kotaku, they stated that Prince of Persia Zero was originally a codeword for the reboot before the project was temporarily put on hold and since then, Ubisoft has remained quiet.
In October, Examiner interviewed Assassin's Creed 4 director, Ashraf Ismail about the possibilities for locale in upcoming Assassin's Creed games and he had a very interesting answer. "I'm not saying we are going there, but one day I would love to explore Egypt as a setting for this game. Ancient Egypt could be a really cool place. We have a really cool explanation for how we can do this, and it is with this Animus device that allows us to go to anytime in history."
Additionally, IGN reported in January that leaked images from composer Mark Kilian's Vimeo account revealed a project called "Osiris" featuring a large silhouette of a man wearing very similar armor that has been seen on the POP Zero protagonist.
What does this have to do with Prince of Persia? During a hacking mission in Assassin's Creed IV: Black Flag, I noticed something rather familiar. The hack opened an email between coworkers and mid-way through, a picture of a large African male with blonde hair stood out looking out to Egypt. It appears the gentleman from POP: Zero might actually turn out to be Assassin's Creed 5's new protagonist.
Given the photo from a year ago, Ismail's comments, the new photo in ACIV, the leaked "Osiris" captures, and AC's two year development cycle, it is safe to assume that Ubisoft is interested in taking a trip down the Nile through the Animus.