According to a Strikeforce press release, Saturday's heavyweight tilt between Andrei Arlovski and Brett Rogers will be five 5-minute rounds. However, MMAForReal.com was told by e-mail that the fight will not be for the interim Strikeforce heavyweight championship. Time will tell, though.
Update by Matt Bishop, 06/01/09 8:30 PM ET: I have just received word from Strikeforce that this fight will be three, not five rounds. So that solves that mystery.