That was the idea behind moving the BC tapings around (SD was supposed to be in Vancouver tomorrow instead with Raw in, I think, Kelowna)...since Rock would be filming in Vancouver, they wanted to get him on the show. It could happen, but you would think that if he were going to be there in any prominent way they would have hyped it last week. He could do a surprise run in for a save, I suppose, but it doesn't make sense to me that if he were going to be there they wouldn't plug it in advance.
It may play well on TV, but for the live crowd of average redneck Joe's, it was incomprehensible. Actually, I forgot to include NXT/Superstars spoilers...but I'll tell you this: Ricardo Rodriguez beating that rat guy was the highlight of the night.