Simple: he's going to fight hard and dominate most of the match (kayfabe), then...as Cena begins the Five Moves of Doom, Dolph is going to legit crack Cena's skull with a chair, quickly shoot up the ladder as if he just took a five-hour energy shot, grab the briefcase, and ruin John Cena forever.
Then proceed to be fired, and probably beat up backstage.
Whether she turns heel (a higher possibility right now in my opinion than I thought it would be because they seemed to wrap up her "feud" with Tamina AND Vickie last night quite quickly), or she accidently costs Cena the match...she will play a role in the finish.
She's the top draw diva at the moment and she's not scheduled for anything. That doesn't make sense. She will make some sort of appearance on the PPV.
If she does cost Cena the match, I hope it's because she turns heel and joins Dolph. Maybe Vicki and Dolph break up before the PPV (Vicki cares more about her job), and Dolph can finally have that Sensational Sherri in his corner.
Like I stated in another topic, I see a lot of similarities to HBK when I look at Ziggler. The charisma, potential, the selling...and of course, it's a coincidence (maybe) that he used the Sweet Chin Music to win his match a couple weeks back (and, in this other clip, he actually runs through HBK's motions):
AJ can be at his side, even mock Sherri by bringing a mirror out...and if HBK ever wants another match someday (I have a feeling he will), that could be a WrestleMania match between the two.
Would be awesome if Cena wins the briefcase and becomes World Heavyweight Champion by Wrestlemania time while The Rock is the WWE Champion. Then they have Rock/Cena II for both titles at WM and the winner unifies them at last!
But nah, Ziggler will win after a bunch of interference.