Once upon a time, Brock Lesnar was going to ditch the WWE and sail off into a UFC sunset, possibly for good. Then, when Roman Reigns announced his second Leukemia diagnosis, Vince McMahon pulled Lesnar back into the fold. According to Dave Meltzer, Lesnar has been signed to a new contract with the WWE, that will keep him in the company at least through WrestleMania 35.
Lesnar was handed the Universal Championship at Crown Jewel, in a squash match that had many wrestling fans rolling their eyes. Allegedly, there's a clause in the new deal that permits Lesnar to book UFC fights while still remaining signed with the WWE. There is a great deal of speculation as to whether or not Lesnar will actually wind up back in the octagon, for a much-teased fight with Daniel Cormier.
The biggest hurdle is that Lesnar has to pass six consecutive months of drug testing in order to qualify for the match. His new wrestling obligations and a possible retirement by Cormier may also complicate the issue.
In an era when wrestling's viewership is dwindling, Lesnar is one of the few performers who's still a legitimate draw. It makes sense that McMahon would bend over backwards to keep him on the roster.