@Out of My Vulcan Mind...these are just personal suggestions, re: Rose Bryne, Emmy Rossum, and Oliva Wilde. They're not in official or even rumored contention.
Surprised no one has really addressed Dianna Agron. I believe she was in contention or at least rumored for the Gwen Stacy role in "Spider-Man" as well. I know she's one of the stars in "Glee". She's also in the upcoming "I Am Number Four" (which looks horrid). She looks like she could be Lois but I'm not familiar with her work. She's the only one out of the others who I don't know. Malin Ackerman...she doesn't strike me as being a good actress but she's obviously worked with Zack before so who knows.