"Last week it was revealed that Gus Johnson's contract with CBS had expired, and on Tuesday morning it was reported that Johnson has accepted a job at Fox. But that doesn't mean he's done as the voice of mixed martial arts on Showtime, the sister network of CBS.
Sources told MMAFighting.com that Johnson's contract with CBS was for basketball and football, and that his deal to call fights (both MMA and boxing) for Showtime was a separate contract. That contract is still in effect, and Johnson will call Saturday night's Andre Ward-Arthur Abraham boxing match for Showtime. Although Showtime hasn't yet announced who will broadcast its next MMA show (a June 18 Strikeforce card), Johnson is expected to call that event as well."