Attention all Big Brother Australia fans, we have some very exciting news for you.

Filming for the upcoming Back To The Future season commenced on October 12 in Sydney, and it’ll feature some of your fave former housemates competing against 12 fresh new faces.

Here’s what we know so far… including the leaked cast, a Tully Smyth and Drew Anthony reunion and some inevitable on-set drama.

First up, we’re going back as far as the early 2000s. Long-time fans will be pleased to hear winners Reggie Bird (2003) and Trevor Butler (2004) are returning.

We also have it on good authority that Estelle Landy (2012) and Layla Subritzky (2012) have signed up – but will they perform Oats A La Layla?!

Meanwhile, Tim Dormer (2013) will return to Australia’s most famous abode as he makes his third appearance on the franchise after a stint on Big Brother Canada in 2016. Tim will be perfect in the new strategy-based format, and we can’t wait to see him manipulate the housemates again!

Lastly, we’re told that both Tully and Drew have signed up to return to the show they fell in love on – yet something went down on-set last week.

While we can confirm Drew is very much in the house right now, our source tells us Tully never made it inside last week as the arrivals night was filmed – despite being scheduled to.

Did she change her mind? Did producers decide to hold her back to later surprise Drew as an intruder? Will we ever get to see the pair of them reunite? It is worth noting she has been noticeably silent on social media for a few days now.

As soon as we know, we’ll let you know…