As of this writing, here are the matches that have been announced:
#1 contenders match for the Universal Title – stipulation not yet announced
Roman Reigns vs. Bobby Lashley vs. TBD vs. TBD vs. TBD vs. TBD
AJ Styles (Champion) vs. Rusev
Those are the announced matches but here are two more matches scheduled for the show. One of them will be a steel cage match. Here are the two additional matches scheduled, based on what people in the company were told:
Steel Cage Match
Kevin Owens vs. Braun Strowman
Dolph Ziggler (Champion) vs. Seth Rollins
Also, the 6-man match will be billed as a 6-Pack challenge.
Extreme Rules will take place on July 15 at the PPG Paints Arena in Pittsburgh, PA.