MacGuardians.de (German) claims that the Superbowl will bring a surprise for Mac users.
According to the German site, their sources imply that the Superbowl will bring something big from Apple.
Earlier articles did note that Apple was considering a 20th anniversary Ad for this year's Superbowl... but a subsequent (Jan 20th) CNN Money article revealed that Apple did not have "any plans to advertise during the Super Bowl to mark the ad's 20th anniversary."
MacGuardians has not been a particularly vocal rumor site, so their accuracy is unknown.