The season actually launched a couple of days ago. The first TV show will be on Monday, but live feeds are back and already on. Housemates are currently moving in. If you have a VPN, set it to Austria and you can watch it here for free. If you set it to Germany, you've got to pay for the feeds.
German users usually prefer a divided house over a single house, so one would indeed expect a second area. But I'm not so sure if there is a second house this time. They've kept houses a secret in the past, but this time they've made a big deal about the fact that there is only one house and that it's a container like it was in the old days. Also, the fact that they've revealed two diary rooms, kinda indicates that there won't be a second house or area. Previous poor areas used to have two diary rooms, too, but they would never acknowledge the second one.. it just looked slightly different. That said though, the entry hall has a second door that could lead to a second house. Might be the games area though.
I'd rather expect some kind of rewards room or HoH room than a proper second house. This year, viewers will be able to vote for a daily "container chef" whose job will be to determine the two houseguests that have to babysit a buzzer in the outside area. It has to be pressed every 10 minutes at night, otherwise Big Brother will turn on the lights in the whole house and play an alarm into the house. It's something they've taken from I'm a Celebrity. At least in Germany, at least two people have to guard the campfire at all times, which usually leads to people bitching about the other campmates.
Live competitions will be used to determine if housemates are allowed to keep their daily shopping. So there isn't really a chance for viewers to send people from the rich house to the poor house like they've done in previous years.
Also maybe worth mentioning: They're currently casting for a new regular 3-month season in Spring 2024. But there has been no channel so far that wanted to confirm that they'll be airing the show next year.