Why will Orton take Rey's spot. Cards are always subjected to change and this could just be another case of it. Anyway, the main event will be for the WWE Championship. But the other main event which is actually going to headline the PPV will be for the World Championship. And that match will either be Rey Mysterio vs. Kurt Angle, or Rey Mysterio vs. Randy Orton vs. Kurt Angle. Either way Rey Mysterio WILL be in the main event which headlines the PPV, and it WILL be for the WORLD HEAVYWEIGHT CHAMPIONSHIP. Believe that.