It seems that The Rock has hinted that he would return at a PPV in order to further his storyline with John Cena for Wrestlemania 28. Many have tried to deduce where that return might take place. The wise seem to think that this return will be at Survivor Series, the last of the Big Four for the year, instead of SummerSlam, especially with it being held at Madison Square Garden.
Source: prowrestling.net