The long-running reality show will return this summer for the channel's second regular edition.
Host Brian Dowling and its spinoff show presenters Emma Willis, Jamie East and Alice Levine appear in the clip, which sees an Olympic-style contest for housemates trying to enter the compound.
Watch the commercial below:
Narrator Marcus Bentley is heard saying: "Who will qualify?"
Dowling adds: "Let the fun and games begin."
This year's Big Brother will reportedly see viewers select a wildcard contestant to join the already-picked housemates.
The ten-week classic series in the summer will be followed by 2012's second celebrity edition in the autumn/winter.