Reggie Bird - 2003 winner
"This may be a new game, but I'm still the same old Reggie," the 2003 winner says in the official first look.
Trevor Butler - 2004 winner
The 2004 winner is also making a comeback!
Estelle Landy - 2012 housemate
As is 2012 housemate Estelle Landy.
Layla Subritzky - 2012 runner up
And 2012 runner-up Layla Subritzy, whose brother David recently appeared on I'm A Celebrity... Get Me Out Of Here!
Tim Dormer - 2013 winner
"Hey Big Brother, did you miss me?" 2013 winner Tim says in the preview.
Tully Smyth and Anthony Drew - 2013 housemates
"History is not going to repeat itself," Tully Smyth can be heard saying in the first look, no doubt referring to her infamous on-screen romance with Anthony Drew - who is also returning to the show.
Dave Graham - 2006 housemate
"Last time was a wild ride," 2006 housemate farmer Dave says in the trailer.
As for the fresh faces, so far we have...
Johnson - Big Brother superfan
"I'm a massive Big Brother fan. I've watched every second of every episode season," the new housemate says.
Joel - Fitness fanatic
"I am a strong physical player," Joel reveals.
Aleisha - Entrepreneur
"I'm a very good liar; lying comes scarily easy to me," Aleisha adds.
Sam - Intimacy coach
"Seduction is an art. I flirt with women just as much as I flirt with men," Sam muses in the preview.
Josh - Ex international model
Hailing from Byron Bay, 32-year-old former international model Josh hints he has the potential to "get under people's skin" in the Big Brother house.
“I want to be a leader. I got no desire to be a sheep," Josh shares.
“We are here to win a game. You wanna keep playing a happy family? We are not here to make best friends temporarily. I’ll put a target on your backs too,” he admits to his fellow housemates on day one.