According to PWInsider.com, Wyatt was warming up in the ring when he suffered what appeared to be an ankle sprain. He was then taken backstage in a cart. There are no further updates at this time but it does not appear that he will miss the show.
http://pwinsider.com/article/92693/injury-to-wrestler-in-a-top-match-at-todays-wrestlemania-warm-up-notes-for-tonights-show-espn-e-60-trailer-online-trishlita-answering-questions-rusevs-army-wont-be-all-actors-and-more.html?p=1
http://pwinsider.com/article/92693/injury-to-wrestler-in-a-top-match-at-todays-wrestlemania-warm-up-notes-for-tonights-show-espn-e-60-trailer-online-trishlita-answering-questions-rusevs-army-wont-be-all-actors-and-more.html?p=1