The trailer for "UFC 121: Lesnar vs. Velasquez" is out. The show will see Brock Lesnar defend his UFC heavyweight championship against No. 1 contender Cain Velasquez. The show also will feature a welterweight bout between Jake Shields and Martin Kampmann and a light-heavyweight clash between Tito Ortiz and Matt Hamill. The card will emanate from Honda Center in Anaheim, Calif., on Oct. 23.