In Demand is advertising Rey Mysterio for Wrestlemania XXVIII in their promotional blurb for the pay-per-view. You can view what they wrote below:
Witness the once in a lifetime collision of The Rock and John Cena as they face off on the grandest stage of them all. Welcome to WrestleMania, the most anticipated event in WWE history! Don't miss Undertaker, Triple H, Kane, Rey Mysterio, CM Punk and all your favorite WWE Superstars at WrestleMania, Sunday, April 1 at 7pm ET/4pm PT, live on Pay-Per-View.
Click here for Wrestlemania promotional information by In Demand.