I think Mysterio will win. He is just back from injury and the main event is full so they will want to give him something to do as he is a name. The Miz winning was just a thank-you for the movie. He is still getting pedigreed off camera and losing clean.
As for Sandow. All things point to him winning. His debut was good, he gets great heat(well actually, Vince doesnt give a fuck about reaction), DX Segment interruption and the beatdowns. They just all point to them having confidence in the guy. I STILL would not put it past them to pull a lolbroduswinsletsdance scenario, but I do not think it will happen.
Well, first, let me say this. Vince does care about reaction, just not in the same way fans do. If Vince likes you, he'll push you whether the audience gives a fuck about you or not. That's the underlying thing, Vince's own mandate on a talent. If he doesn't like you, and you get over, he'll milk you for all you're worth, and then bury you, just to stick it to you because you got over without his help, but if he does like you, and you do get over, he'll use that reaction to push you even harder. In fact, I guarantee that if Del Rio were over, he'd be getting pushed even harder because Vince would love the fact that he got over through his own mandate.
As far as Sandow vs Brodus, ultimately, Sandow is going farther. Hell, Sandow has already gone farther than Brodus, really, so no matter who wins, Sandow will benefit in the long term. Which is exactly the same as what happened to Ziggler and Miz, they got beat by Clay and it didn't matter because Clay can't go anywhere because his gimmick won't allow him to and they can go anywhere on the card. My main concern is that Sandow is getting all the offense. If week after week, one guy continually one ups the other, he usually loses, unless maybe a special circumstance. Now, I guess you can argue it won't apply because WWE just doesn't care about Brodus and they'll completely sacrifice his credibility to get Sandow a bigger rub, and I could see it, but it's a little worrying.
As far as Rey vs Miz, I don't know who wins, but I really want Rey to win because I desperately want a face holding that Intercontinental Championship so that Sandow can go after them.