Re: After Mania, when Cena wins...then what?
Well, Cena faced Orton on PPV seven times one-on-one. He's face Punk three times on PPV, so I presume they'll face again at least twice in 2013.
Actually, they'd be smarter booking Punk vs. Cena @ Wrestlemania and Cena vs. The Rock @ Extreme Rules if he is available. WM is guaranteed a big buyrate, whereas Extreme Rules is not without a huge match.
Other feuds/matches could easily involve Ryback, Daniel Bryan, Dean Ambrose, Antonio Cesaro, Dolph Ziggler and The Miz, who will turn heel sooner rather than later.