The Miami Herald is reporting that WWE announced that The Rock will be appearing live on the January 7th episode of RAW from Tampa, FL. He will also appearing at the SmackDown taping the following night, January 8th, from Miami.
The Rock is currently scheduled to face CM Punk for the WWE Championship at The Royal Rumble on January 27, 2013 at the US Airways Center in Phoenix, Arizona. Rock has been prominently featured in advertising for the event, including in the show's trailer, which you can view below:
Source: The Miami Herald