Partial Source: The Wrestling Observer Newsletter
We can confirm that The Undertaker reached out to WWE during the past week or so and has told the company that he wants to work the WrestleMania 29 pay-per-view. He is currently training for a return and pitched a potential opponent for the event. At this time, it is known that the possible opponent will NOT be Triple H or Ryback.
For those unaware, 'Taker has a gym and full-sized wrestling ring at his home he shares with his wife Michelle McCool.