On Friday's episode of SmackDown, it was announced that The Shield would get their WrestleMania debut at WrestleMania 29 against Randy Orton, Ryback and Sheamus. It was previously rumored that Ryback would face Mark Henry at WrestleMania, so the match appeared to show a change of plans.
However, a hidden image on the WWE website shows what the actual match will be. The current image up, "6man_1.jpg" shows Ryback in the match. If you change the file name to "6_man2.jpg", you get his replacement, The Big Show. You can click here to view both images.
This likely means that Show will replace Ryback in the tag match and Ryback will face Mark Henry as planned.