As was noted earlier, Happy Corbin attacked Pat McAfee after WWE Money In The Bank went off the air. You can see the video of the attack below.
After the attack, WWE announced that Corbin and McAfee will face off at SummerSlam. WWE has been teasing this match for weeks but Corbin had been unwilling to accept the challenge until now.
As of this writing, the only two confirmed matches are Corbin vs. McAfee and Undisputed WWE Universal Champion Roman Reigns against Brock Lesnar in a Last Standing Match.
Another match that may be announced soon is Theory vs. John Cena. After MITB, Theory referenced Cena again. In addition to the Cena match, WWE is teasing that Theory will cash in after the Universal Title match.