My Summer Slam Prediction....
Someone on the WWE7 is going to either leave the match or decide at the last minute to not show up. Something that's going to make the crowd think they're a player short. THen to take his place will be the "man", the legend, the son-in-law of the next senator from Connecticut, Triple H. But, HHH will turn and give some reason that "he knows how to lead a group" and be the new leader of Nexus.
After all, HHH is on the cover of this month's WWE Mag with the caption of him being 'back'. And triple H leading the Nexus will give it the cred it needs because the one dude who runs it (see, I watch every week and still don't care to know his name) is pretty friggin lame.