A while back there was a casting list with numerous actresses being named for the role of Lois Lane. Hollywood.com seems to have spoken with Ms. Kunis on the topic of her potentially being in Superman: The Man of Steel as Lois Lane.
"It's just a rumour. According to the internet I'm really busy."
With the buzz from her role in "Black Swan", more eyes are on her more than ever for roles in upcoming films, but it seems not for Lois Lane.