Superhero Hype confirmed with the WB that Routh is indeed cast as Superman. Sources added that they don't know when Lois Lane will be cast. They also threw in tidbits that Superman writers Michael Dougherty and Dan Harris were recently spotted on the WB lot going through stacks and stacks of Superman comic books, so it appears that they are going back to the source material for inspiration.
Our sources also confirmed that General Zod will be involved in some capacity. More to come!