Jason Momoa cast as villain opposite Sylvester Stallone in Walter Hill's untitled film

Jason Momoa is set to play the villain in the upcoming action film directed by Walter Hill starring Sylvester Stallone. The film was formerly known as Headshot and is based off the graphic novel "Bullet to the Head" created by Colin Wilson and Matz. Alessandro Camon wrote the script that tells the story of "a New Orleans hitman (Stallone) who teams up with a Gotham cop to take down the killers of their respective partners." 

The cast also includes Sung Kang (Fast Five) and Sarah Shahi (Fairly Legal), who plays Stallone's daughter. Momoa starred as Khal Drogo in HBO's Game of Thrones and will be seen as Conan in the remake of Conan The Barbarian later this summer.

I liked Momoa in Thrones and am interested in seeing him as Conan. This will be cool to see him playing a bad guy. What are your thoughts?