Undertaker had given word he would be working the PPV several months back and there had been plans in place for a CM Punk storyline leading into the PPV.
The story making the rounds the last few days was that Undertaker's physical well being was being called into question and it was no longer fully confirmed he would be working the show.
This won't be the first time that WWE has been back and forth on whether Taker would work the biggest show of the year. In the past, he always came through and worked. We'll see soon enough whether he does or not. If he doesn't, there will need to be some plans tweaked.