BBAU 4.0 premiered with 12 diverse housemates, live evictions, and public voting, aiming for raw, unscripted drama.

Big Brother Australia’s 2025 reboot, titled BBAU 4.0, premiered on Network 10 at Dreamworld with a live eviction format, public voting, and a 24/7 livestream on 10Play. The season, hosted by Mel Tracina, faced delays due to storms but launched with 12 housemates—ranging from 21 to 49—entering without luggage, sparking immediate tension. The cast includes a disability advocate with Tourette’s, a Black lesbian, and a Sri Lankan woman, though racial diversity remains limited. Despite claims of avoiding fame-chasers, some housemates have public profiles. Early dynamics reveal alliances, conflicts, and polarizing personalities, with a potential 13th housemate to be chosen by viewers. The season emphasizes raw, unscripted interactions, aiming to revive the show’s original appeal.