I feel as if this feud is just a vehicle to get Cena his 20th World title reign.
Del Rio couldn't get heat in Mexico City no matter what he did(It's amazing how many people think him not getting boo'd when he's like a national hero there means he's a bad heel), so having that be his go home show to the PPV wasn't exactly a fair representation. I love ADR's style and gimmick, and I think he plays dirty enough to be a top heel anytime. I actually have not been deeply interested in any 1v1 feuds with Cena for a while (blah blah typical IWC response, but he really is boring at the ME level after hot potatoing the title around trying to catch Ric Flair)
ADR's feuds outside of the titles have been excellent, his Rey Mysterio schtick was great, he did well with Christian and he did a really slick job of drawing heat off Edge's retirement, and he's had a few other fun little feuds. His feuds involving Juan Cena have been lackluster, and I think it's more to do with Cena/ADR having little to no chemistry. WWE's solution will prolly be to bury ADR and give Cena World title #13(Jesus), so we can see him feud with Punk again.
As for how the match plays out, Del Rio isn't a "Knockout" kind of guy, so I don't see him knocking Cena down for 10s without something foreign, if ADR pulls it off, it's going to involve Lauranitis, or a car.
If Cena win's, it'll be a Shoulder tackle, a back drop suplex, a You can't see me, and an Attitude Adjustment. Sorry, spoilers on every Cena match.
The only thing that this feud has made me think, is I can't get Batista saying "Duct tape? really?" out of my head.