According to F4Wonline.com, here is the possible SummerSlam 2013 match card that is currently in the works:
John Cena vs. Daniel Bryan for the WWE Championship
Brock Lesnar w/ Paul Heyman vs. CM Punk.
Kane vs. Bray Wyatt
Cody Rhodes vs. Damien Sandow in a match that puts Sandow’s newly won briefcase on the line
Big E Langston w/ AJ Lee vs. Dolph Ziggler
As of now, the rumored card also features a divas match on the pre-show.
It is also expected that The Shield will have a program with Mark Henry and The Usos. It is not known whether this would be one match, or if The Usos would face Seth Rollins and Roman Reigns for the Tag Team Championship again, while Dean Ambrose faces Mark Henry with the United States Championship on the line. However, there is also speculation that Rollins and Reigns may put their Tag Team Titles on the line against the newly formed Real Americans, a team that features Jack Swagger and Antonio Cesaro under the guidance of Zeb Colter.
Keep in mind the only match that is confirmed at the moment is John Cena vs. Daniel Bryan for the WWE Championship. However, all signs are pointing to a Brock Lesnar vs. CM Punk match at WWE’s annual August pay-per-view.