Partial Source: Wrestling Observer Radio
As of now, there is speculation that either Seth Rollins or Finn Balor will win the Fatal Five-Way match at WWE Extreme Rules, with the winner going on to face Brock Lesnar at WWE’s Great Balls of Fire pay-per-view.
There is further speculation that Lesnar will likely face Braun Strowman at WWE SummerSlam and then possibly Bray Wyatt and Samoa Joe at the end of 2017 and at the Royal Rumble. This would take Lesnar through to WrestleMania 34 and his rumored clash with Roman Reigns.