Brock Lesnar recently signed a new deal with WWE, hence why he was made the Universal Champion at Crown Jewel. While it's a short-term deal which will only keep him part of the company through WrestleMania, that means we're going to be seeing a lot of him in the coming months and Dave Meltzer has now confirmed that he will be feuding with more than just AJ Styles and Braun Strowman.
While no names are mentioned, it's said that there will be a significant angle which plays into Lesnar's future matches in a big way coming up soon and it seems as if this will all tie back into him "not caring" about WWE. Seth Rollins alluded to that during RAW, so it could be that the locker room turns against The Beast and he's forced to fend off all-comers building up to WrestleMania next year.
One thing Meltzer does point out is that "Drew McIntyre is clearly being groomed for a top run" so don't be surprised if the Scottish Psychopath is the one who ultimately dethrones Lesnar in 2019.