As had been rumored, WWE has reportedly made the decision to use John Cena as a guest referee for the Brock Lesnar vs. Jinder Mahal match at Survivor Series, according to Dave Meltzer. However, nothing official has been announced yet.
It was reported that WWE considered The Rock and Stone Cold Steve Austin for the guest referee role, with the condition being whether or not they would actually agree to do it and of course scheduling and money issues. As of now, it appears that WWE will just be going with John Cena.