CBS We finally have news about Big Brother season 28! On Wednesday (May 13), CBS revealed that the new season will once again kick off in July. Specifically, the premiere episode will be 90-minutes long and will debut on July 8. Julie Chen Moonves will once again host the fan fave competition series. Additionally, Big Brother: Unlocked will be back for the second year in a row. The new season of Unlocked will feature "exclusive footage from inside the house, extended interviews, surprise guest appearances and behind-the-scenes access.