Robert Downey Jr. Rumored For Assassin's Creed Movie
Before you get your hopes up, IGN reports the original article was removed by Movie Pilot (however, can still be found through Google cache).
The original report apparently stated that Robert Downey Jr. is set to play Leonardo da Vinci, which may suggest the movie may in part be based on the Assassin's Creed II video game as Da Vinci was featured as a friend of Ezio Auditore.
Michael Fassbender is attached to the film, speculated as the lead, with Assassin's Creed due out May 22, 2015.