Momoa is certainly not as huge as Arnold Schwarzenegger was when he played the role but he's still incredibly well-muscled and he looks wild enough to me.
You can view the trailer and some beautiful images on the official website.
On August 2, the original Conan films are coming to blu-ray. I'm not sure how good they'll look when you can see every little detail. We'll have to see how much work Fox has done to restore them. On July 26, the first season of Conan the Adventurer is coming to DVD for the first time. Robert E. Howard fans are going to have quite a summer!