Matt Bomber will be voicing Clark Kent/Superman. John Noble is Brainiac. Stana Katic is Lois Lane, and Molly Quinn as previously reported is Kara Zor-El. From the stills, looks like they've decided against depicting the Gary Frank art which is disappointing.
I'm sorry to see they're not using the Frank art, but I wonder if the similarities to Reeve and Kidder would be problematic licensing wise in a video production.