The original plan for SummerSlam before it was learned Daniel Bryan needed surgery and would be required to miss a significant amount of time was for him to defend the belt against Bray Wyatt. With the company crowning a new champion at Money in the Bank, those plans have obviously changed.
The new idea that has come up is ways to utilize Brock Lesnar as a challenger for the WWE World Heavyweight Championship. Opponents pitched include Roman Reigns, Cesaro, John Cena, Bray Wyatt, Alberto Del Rio, Randy Orton and Sheamus.
What's interesting out of the list of proposed opponents is that Lesnar vs. Cesaro was a program WWE wanted to do at SummerSlam before the change in course. It's still something that could happen into the fall or some time next year (if it doesn't happen in August).
WWE surveyed fans last week about opponents for Brock Lesnar as the challenger, listing the aforementioned names as possible champions.