In an interview with TV Guide, the movie's producer James Tucker commented on the men that will provide the voices for Superman and Brainiac.
On Matt Bomer..
"He had a jovial energy that was a little counter to what we usually do with Superman," Tucker says. "But he also had that decency in his voice that Superman really needs no matter which way you go with him."
On John Noble..
"I could listen to him all day. John had a lot of energy and he really got into the psychology of what was motivating Brainiac. He brought a level of intelligence, but also that slight bit of crazy that a super villain needs to have under the surface to make him compelling."
For the rest of the interview click on the link below. The movie also stars Stana Katic as Lois Lane, and Molly Quinn as Supergirl. There is no official release date yet.