What a horrible, horrible decision on the part of the WWE.
Sure, I have my biasses and it's very true that I hate Rey Mysterio but even when I think about it in a booking manner, it makes no sense whatsoever. You see,, Mysterio is little more than a one trick pony. Every promo you hear from him will include "How big his heart is", "How many times he has been the underdog" or "How he has defied the odds before"... Words cannot define how much Rey Mysterio bores me. Every single promo that you will hear from this point on will include those that are listed and I am pretty sure that he wont be the Champion for that much longer.
Rey Mysterio is not a good Champion like Sheamus is. Rey Mysterio is a small guy and whilst I don't mind that, it takes away from the Championship for him to be holding it. If Sheamus is defeated clean by a superstar for the Championship, that superstar is likely to get a really good rub from it. However, if they beat Mysterio, well, no big deal really. I can only imagine that they are going to have him feud with Swagger first because of his rematch clause. Then he will likely feud with The Big Show.
I don't mean to be so negative about this but truly, Rey Mysterio's first reign was terrible and I am not very happy that I need to sit through it all again.