Wu-jing.org has the low-down on the story and Donnie's thought about taking on this iconic role:
...The story focuses mainly on the period when Guan Yu was held captive by Cao Cao, showing his inner conflicts, and will see Guan Yu traveling a thousand li on his trusty steed, passing 5 obstacles, beheading six generals. Donnie Yen would play the eponymous historical figure, whileOther potential projects being offer to Donnie Yen include Legend of Saintly Physician Li, a film on a great Ming dynasty healer Li Shi Zhen, and Peter Chan's JungKu: The Man From 18th Hell. Personally, I was really hoping to see Donnie going back to doing modern Hong Kong actioner in the vein of Flash Point and SPL or tackle the possible Donnie Yen & Tony Jaa project but it seems the trend of epic costume swordplay historical films is showing no signs of slowing down anytime soon apparently.Zhang Han YuJiang Wen warlord Cao Cao.
Donnie Yen says, "I don't know why so many filmmakers want me to play folk heroes or historical figures. I have heard that many are shooting Guan Yu films, and Louis Koo would be joining one, very fascinating... To me, this is a very challenging role, I'd be acting and action directing, so the pressure is quite big. My schedule is already fully packed this year, but I'm still getting new scripts, more than I could handle."