A source close to CBS told Soap Dirt that Season 16 winner, Derrick Levasseur, is one of the four returning houseguests who are fully committed to coming back for another chance at the prize money. Derrick Levasseur is regarded as one of the best to play the game of any season in Big Brother fandom. However, Derrick got on a livestream with fellow BB alum Dan Gheesling to squash that rumor.
The source also mentioned Frankie Grande, older brother to pop star, Ariana Grande, is reportedly locked in for the All-Star season. The other two confirmed by the source are Season 19 winner, Josh Martinez, as well as two-time runner-up Paul Abrahamian.