This is going to be a combination of the Coaches and Cliques twist from Big Brothers 11 and 14! I can see them being put into cliques and all returning players coming into the game after the first HOH! Whoever wins the first HOH wins immunity for their clique and their Coach gets HOH!
I could see the show doing this because with a returnee as HOH, they more than likely won't nominate another returnee nor will they nominate the relatives of past players (Paulie and Tiffany). This allows for their preselected favorites to at least remain safe for the first week while the crazy new people become the main targets. I don't see this being an entirely bad idea because I think that with the cast we have seen it could allow for one heck of a season.
With all of the information provided above, I think it is very likely to happen with the more recent list of possible returning players (Frank BB14, Nicole BB16, DaVonne BB17, and James BB17). None of these past players have any beef or any strong ties to each other for that matter (Maybe DaVonne and James could be associated but they don't seem to keep in contact much outside of the house). Tiffany appears to be a normal version of Vanessa so she could easily be protected by DaVonne and/or James. Although Paulie and Nicole don't seem to have an extremely strong connection they both have one thing in common and that is Cody so that could play to her advantage.
My best educated guess as to what the cliques would be:
Brains- Nicole, Tiffany, Michelle, and Bronte
Athletes- Frank, Corey, Victor, and Glenn
Outcasts- James, Jozea, Paul, and Bridgette
Popular- DaVonne, Paulie, Natalie, and Zakiyah
tl;dr I think the twist will be a combination of coaches and cliques with the returnees being Nicole, Frank, James, and DaVonne
