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.
Yeah, I'm not really liking the Superman design they went with there. Although I will say Lois and Supergirl look pretty cute.