ComicBookMovie has posted a rumor that Mailn Akerman could be up for the role of Lois Lane in Zack Snyder's Superman. It seems possible as they've got their Clark Kent/Superman (Henry Cavill) that they would move on to casting the rest of the film.
If true Akerman has a good shot as she's worked with both the studio and Synder on Watchmen previously. HeatVision recently confirmed rumors that Mailn's Watchmen co-star Matthew Goode had been a top choice to play Superman. It's very likely that Snyder could round out the cast with actors he's worked with before.