I agree on the note of a last minute match added in, as even with Hell in a Cell matches, you're going to be struggling to fulfill the time dedicated to the PPV with only five matches. I don't know what it'll be, but it'll happen.
Natalya vs. McCool - McCool. Even though she's had it for forever and a half, she hasn't had it for long as the Unified Champ, and it doesn't seem like there's enough buildup for Natalya.
Bryan vs. Morrison vs. Miz - Bryan. Too early to take the title off of Bryan.
Cena vs. Barret - Cena. People keep quoting rumors about how it's time for Cena to turn heel and how the WWE won't get rid of the Nexus yet, but I disagree. I really don't think WWE will turn Cena heel and it seems to me time to end the Nexus as they've pretty much lost all credibility as a threat. If you don't buy that, I'd say that Cena sells more merchandise as a face, and that the Nexus isn't selling merchandise at all.
Orton vs. Sheamus - Orton. I'd say there's a possibility for Sheamus to win, but it's a bit tricky. If Sheamus wins, I'd predict HHH comes out, beats him up, and the Miz cashes in the MitB. It may be a bit far fetched, but it would give Sheamus an easy way out the Orton-Sheamus rivalry. Of course, I feel it's more likely that Orton will win, and will either be so beaten up from the match that Miz can cash in the MitB, or Orton will just flat out be put over as a dominant champion. Either way the HHH spot could happen tomorrow on Raw or they could have Sheamus pseudo-feud with someone. The important thing here is to end the rivalry.
Kane vs. Undertaker - Undertaker. I don't really like it, but it's my prediction. Someone posted before me and said that Bearer can turn on Taker, which I'd say is possible, but honestly I just feel it's more likely that the WWE will capitalize on how Taker is over on Kane right now and give him the title. A Buried Alive match, if accurately predicted, could happen either way.