According to The Wrestling Observer Newsletter, WWE Champion Brock Lesnar is currently on hiatus from the company and will likely be making his return some time around January 2020 which is when his build for The Royal Rumble PPV Event will start.
The next time Lesnar is scheduled to make an appearance is on Sunday, January 26th 2020 in
Houston, Texas, which is when The 2020 Royal Rumble PPV Event takes place.
There is no word yet on who Lesnar will be defending his WWE Championship against, but he will likely be back on Monday Night RAW on The Royal Rumble Go-Home Episode or the episode prior to that for the build to that match.
This past Sunday night’s WWE Survivor Series saw Brock Lesnar successfully retain his WWE Title against Rey Mysterio in a No Holds Barred Match.
Source: Wrestling Observer Newsletter