"On the live premiere, you're going to find out who the four teams are and the way we're going to form them is, you know, we always like to move groups of four in at a time," Julie explained to Us Weekly.
"So each group that moves in, they're going to have to head right away to the backyard and compete to become the team captain. And after each group moves in, you have four team captains."
Julie said the four team captains are then going to find out something live on the air..
"[They learn] that each captain has to form a team of four. They have to pick the other members of their team. And it has to be two men, two women," Julie elaborated.
"And they're doing this based off of first impressions. They're going to be presented with a little snippet of a houseguest describing himself or herself. And then what's really going to heat things up is after the teams are formed, the four team captains are going to compete for one of them to become Head of Household."
Rich and Allison had also previously teased another huge twist at the end of premiere night having to do with the theme of casino meets "Big Brother Beach club."
"So at the end of the night when the HOH is feeling, 'I have safety for a week, my team has safety for a week. Everything's hunky-dory,' I'm going to present that Head of Household with an offer that he or she really is not going to be able to refuse," Julie shared.
"And this whole summer, it's no risk, no reward. And I'm going to present them with a double or nothing challenge," Julie explained.
She added, "They're going to have just a minute to decide on their own. They can't be influenced or huddle up and talk to their teammates about it."
Julie noted the houseguests must take advantage of possible rewards in the game this season in order to make it far into the game and eventually win.
Julie confirmed more huge risk vs. reward offers will pop up throughout the rest of Season 23.
"Throughout the season. That's the whole theme. We're calling it the 'Big Brother Beach Club,' but it's a beach club that would be set, if you will, in a Monte-Carlo kind of background. So, it's definitely a gambler's summer," Julie said.
And the surprises will continue into the upcoming Sunday, July 11 episode of Big Brother.
"We're also introducing a new competition that will unveil itself on the first Sunday night show," Julie told Us.
"So Sunday nights are going to be excited for a second reason: you're not just going to find out the two people that the Head of Household has nominated for eviction, you're also going to have this other competition with a whole other layer to it."
Big Brother's tagline for Season 23 will reportedly be "go big or go home," and Julie said she's looking forward to more laughs and unexpected events on-camera and behind the scenes.
"What I love is, you know, we always tell the houseguests to 'expect the unexpected.' I always love the unplanned things that kind of happen to us," Julie said.
"Looking back, it was kind of a funny moment when like the door to the Have-Nots' room wouldn't open on premiere night. We weren't laughing then, but you know, like the old saying, if you're going to laugh about it later, you might as well laugh about it now."
Julie also pointed out how there had been a technical glitch on the show's first-ever triple eviction night.
"When I went back on screen to talk to the houseguests, they saw the words behind me. So I love those unscripted, unexpected moments that happen every summer that surprises all of us and puts us back on our heels a little bit. It's live television," Julie said.
Big Brother will continue to air three episodes every week this summer following its July 7 debut.
Beginning on Sunday, July 11, the series will air on Sunday and Wednesday nights from 8-9PM ET/PT as well as on Thursday nights.
Each Thursday night episode of Big Brother, hosted by Julie, will feature a houseguest's eviction and air live on the East Coast from 8-9PM.
Big Brother follows a group of strangers living together in a house together that's outfitted with 94 HD cameras and 113 microphones, recording their every move 24 hours a day.