Oh my goodness! Look at that! It's Assassin's Creed's Ezio in Prince of Persia: The Forgotten Sands. What sorcery is this!?
Ubisoft explains how to get the skin, along with a challenge room, through its in-game Uplay rewards system. It's rather easy, mostly just creating an account and playing the game to unlock the rewards. But Ubisoft wants to make sure you figure it out, so I'm going to demand you watch the above video so you don't make any mistakes.
Additionally, for a limited time only, players can access a skin of the Prince's brother, Malik. You'll have to text "PRINCE" to 44144 to get it. Usual text service charges apply and blah, blah, blah.
I recently reviewed Prince of Persia: The Forgotten Sands, and -- surprise! -- I totally liked it.