#4 Match with Daniel Cormier
Brock Lesnar confronted Daniel Cormier at UFC 226 and let it be known that he was coming for Heavyweight championship. Interestingly enough, Cormier is planning to retire soon and said in an interview that a match with Brock Lesnar would probably be his last. Of course, he said he might fight before that, but he reiterated that he wanted Lesnar to be his final match.
With that being said and Lesnar's UFC suspension up in January, it makes sense that Lesnar would leave WWE after Summerslam to train for his fight Cormier. Fans already commented on the fact that Lesnar was losing weight and getting into shape, which means that he could be preparing for an extended stint in UFC.