I've heard that they were trying to show Superman / Clark Kent in his thirties or forties.
I can't imagine Lois would be a minor character, since they cast Amy Adams. I like the actress (LOVED Enchanted, not so much Leap Year) but I don't see her as Lois Lane.
One of the problems I had with Superman Returns was it seemed like Ken and Barbie do Superman. Plus, that Lois looked too young to have a son that old, she'd have to have been... what 21, when she got pregnant.
I'm looking forward to the next movie with anticipation, but also a heavy heart... with a blonde Superman and a red-headed Lois Lane... Lots of dying in Hollywood. (Pun intended.)
