According to PWTorch, Dwayne "the Rock" Johnson confirmed at WWE's press conference today that he will be making an appearance at next year's WrestleMania 29. Yesterday the time and location was made official by WWE.com, and the big event will take place at the MetLife Arena in New Jersey on April 7th, 2013.
Additionally, The Rock posted the following on Twitter:
"Met Life Stadium. Home of Wrestlemania 29. 2013. #MetLifeWillGetRocked."