When The Rock tweeted that he will be at 1,000th Raw Episode in St. Louis, CM Punk was quick to respond.
"I'm waiting" is all that CM Punk said to him. When The Rock left, he mentioned that he will be coming back to become the WWE Champion once again. This tweet is interesting because it could foreshadow what Wrestlemania 29's WWE Championship match will be. It has been heavily rumored to be Rock vs. Cena again, but there has been internal discussion about that plan changing.
CM Punk has openly criticized some of the "part time" wrestlers in the past, so this tweet can just be some sort of jab at The Rock. Nonetheless, the Twitter war a year ago is what started CM Punk and Chris Jericho's feud this past year.