According to a source within WWE, there have been some major discussions taking place within WWE about what to with John Cena at SummerSlam tonight.
For the first time, Vince McMahon, the creative team and Cena himself have had discussions about possibly turning Cena heel, and having the heel turn take place tonight. Although a heel turn has not been confirmed, and plans can change at the last minute, I was told the feeling backstage at SummerSlam today is that "all bets are off," and anything can happen.
For what it's worth, I don't see Cena turning heel tonight as my feeling is that he's too big of a cash cow for WWE at this point, and the company will end up wanting to hold on to his earning ability for a bit longer.
That is from the article home page and it was written by Nick Paglino. Now I know Cena will turn heel.