Rumours report that The Rock is seriously considering wrestling a few matches before his WrestleMania 29 match.
For some time I have been saying Rocky will show up at the 2013 Royal Rumble and win it to get a world title shot at WrestleMania. I still think this is true.
But with news he may wrestle a few matches before WrestleMania, I think he will also compete at either Survivor Series or SummerSlam. I am unsure which, but am currently leaning towards Survivor Series.
The current rumour is that John Cena vs. CM Punk for the WWE Championship (a match due to occur at the 1000th episode of Raw) will see a rematch at SummerSlam. The Rock, gunning for the title, could easily insert himself in this feud on tomorrow's Raw, making the SummerSlam match a triple threat.
WWE tends not to do triple threat matches very often, and tends not to put returning legends like The Rock in complicated matches like that, as their return is enough to get an audience worked up, let alone adding anything else to the mix. If Cena beats Punk tomorrow, Punk using his rematch clause at SummerSlam is very logical, with no space for The Rock in the mix.
The other option is Survivor Series. Anything could happen there, really. The Rock has a long history there—he made his début there in 1996, won the "Deadly Game" tournament in 1998, helped defeat Team Alliance in 2001 and made his return to the ring after over seven years at Survivor Series 2011.
It would be the logical place for him to have the first battle in his quest to become WWE Champion once more.