At the WWE SmackDown tapings last night in Richmond, Virginia, it was officially announced by Teddy Long that Rey Mysterio would be added to the SmackDown Main Event at WrestleMania 22 for the World Heavyweight Title.
As of now, it will be Kurt Angle vs. Randy Orton vs. Rey Mysterio for the World Heavyweight Title. It should be noted that there is a World Title Match scheduled for SmackDown next week between Angle and The Undertaker in Washington, D.C. This is why Long referred to the match as Mysterio vs. Orton vs. "The Champ" at WrestleMania.