At first I was thinking 'SummerFest' looks ass, but I can see it not being too bad.
Kane will retain his World Title, but probably not through a victory. I expect an interruption from The Undertaker and the match will end in a No Contest. It will be Kane who attacked The Undertaker, I thought this as soon as Kane won MitB, or maybe a little before then. I'm expecting some kind of Casket Match at Night of Champions between Kane and The Undertaker, followed by a rematch at Hell in a Cell where 'Taker defeats Kane for the World Title.
I haven't watched Smackdown since it moved channels, so I don't have much input on this match. But yeah, I expect the Undertaker to appear.
Sheamus beats Randy Orton somehow, just because he hasn't had the title very long. The Miz may well cash in, but he'll fail to win the title.
I'm sort of 50/50 on this one. They've both been on a mean streak lately. But yeah, Sheamus will likely win somehow. And without a doubt Miz will show up and cash in Money in the Bank, but I half expect Triple H to show up, Miz run out of the ring and Pedigree a beaten up Sheamus.
My shot at Khali's replacement is probably Vince McMahon, as he was attacked by the Nexus as well. Although it could also be Evan Bourne (who seemed the most likely at first) or maybe Daniel Bryan (former NXT star), though there's been no talk of him signing a new contract. Triple H is another possibility, but his return would seem a little soon. The Miz is also another shout, because they may not want him to cash in just yet.
Agreed with Vince McMahon, but I think they'll be aiming to recruit a big-shot superstar, so I don't think Evan Bourne will be in the match. If Triple H appears it will most likely be to kick Sheamus's ass, not join Team WWE out of the blue to beat Nexus. Miz will most likely be their first choice, but somehow after seeing what went down on NXT I don't see it happening. It's mostly because he'd be in no shape to cash in his contract if he does join (in the scenario in which WWE vs Nexus match will be before Sheamus vs Orton). Bryan Danielson (aka Daniel Bryan) won't show up because he's been wrestling for other companies since he defected Nexus (check Wiki).
Also, this is my other expected occurrence. It's so ridiculous that it will probably happen, so here it goes. John Cena (yes, John Cena) will heel turn on Team WWE and join the Nexus at SummerSlam.
This won't happen. John Cena is basically a puppet to the WWE Universe, so he'll do anything to have the fans on his side. Naturally, joining the enemy would be uncharacteristic.
This can allow a few things to happen. Randy Orton (after losing to Sheamus) is no longer allowed a Title Shot - which allows him to become leader of Team WWE. Triple H is then free to return to face Sheamus for the World Title at Night of Champions maybe. We'll probably find out who the General Manager of Raw is, and if it's the 'too obvious for it to be him' Stone Cold, he could join Team WWE as well to make it 8vs8 at some point.
I must be missing something. How will it be 8v8 when Nexus is currently 7?