John Cena, who is scheduled to return to WWE at the upcoming RAW 25th anniversary show, is scheduled to work the RAW brand after the Royal Rumble.
As previously noted, Cena is being advertised to appear at the upcoming WWE Fast Lane event and will also be appearing in the 30-man battle royal match at the Royal Rumble pay-per-view event.
Cena was originally rumored to be the next challenger for the WWE Championship, however those plans seemingly changed after the company decided to put the title on AJ Styles. It remains to be seen what they do with Cena once he returns.