Only commenting on the Survivor teams because I don't really watch Big Brother (and only did a few seasons of TAR, I'm sorry!)
I've never liked Corinne at all. Her meanness never comes off as entertaining or clever, the way that you'd get from people like Parvati or Courtney Yates, but it's just sort of "I'll choose the lowest blow possible and pass that off as a personality trait." The less screen time we get from her, the better. Eliza is a good enough tradeoff that I'll probably still root for them, unless she winds up being terrible and whiny, in which case I'll probably just be disappointed.
Rupert and Laura... egh. I understand the people that hate them, but I also understand the people that love them. Rupert can come off as overly sanctimonious or full of himself, but I think he's a genuine guy that just doesn't have the social skills to understand how he's being perceived sometimes - and the same definitely goes for Laura to a much more extreme degree. I think they're great people in real life, but I definitely see them being targeted and outmatched here, and they'll probably get a lot of negative attention that they don't deserve. It might also go the opposite way and they get a ton of positive attention that they don't necessarily deserve, which will only tick the haters off more. It's really hard to say, but all in all I hope for the best for them.
Bret and Chris would be a really interesting dynamic, I think. The two of them didn't appear super close on the show, but I really liked both of them separately (which is saying something, since the older males almost always tend to be my least favorite contestants after the way-overplayed "hag" archetype) and I'll be interested to see how well they can work together. Chris at least was a pretty solid athlete, and I don't remember Bret winning much, but he wasn't a slouch, either. I could see them either going really far or going out early.