Channel 7 has released an extended sneak peek of the new season of Big Brother Australia ahead of its premiere in the next couple of months.

The entire season was pre-recorded in advance before Christmas, and once again as many as 20 housemates are thought to be part of the competition.

A new trailer reveals the first look at some of the housemates, as well as a completely renovated BB house - and also hints at some of the challenges in store across the season.

In the voiceover, Big Brother suggests that the new season may be more twisty than usual, saying: "Think you know Big Brother's game? Think again."

Watch the trailer below: