Wil's going to have the most proactive reaction. Main reason I've already moved him off of Team Janelle. He will NOT work with her post-twist and everyone in the house knows it. Oddly enough, even though he'll bitch he may actually be secretly happy about it because he won't feel stifled under her thumb any more.
Joe has said he won't respond well to the coaches coming into the game. I get the impression he may be one of those "all bark, no bite" types, however. He's practically been obsessed with raising his personal stature with Janelle and I really don't see any reason that would change. I could be wrong, though. Perhaps he'll emerge as the anti-coach leader/jury taint that Janelle has feared Frank would have been.
Ashley is pretty much joined at the hip with Janelle.
Both Shane and Danielle have been prepped for the twist as of last night. They both seem fine with it because it effectively levels the playing field for them with everyone else. On top of that, Danielle is an attention-seeking puppet and Shane's too dumb to register a reaction to anything until days after it happens. He's a little slow.
Ian has already checked out of the game and will simply see the twist as a defined deadline for him to achieve his goal of getting to jury. Dan has been feeling him out since Sunday night for his side alliance potential which should get Ian's vote in his back pocket but I don't see Ian going deep into this game. Depends on how far he wants to stretch his "Have Not" record.
And Jenn? Well, it's hard to tell what's going on with Jenn. I don't see her sticking with Boogie, though. I see her becoming a side alliance for Dan and Joe.