2019 is a new year for WWE, but nearly 17 years after his debut, John Cena is still here, and you still can't see him.Following a 2018 spent for the majority filming in China with Jackie Chan, Cena is back, but no-one quite knows how long for.After his tag team victory with Becky Lynch on SmackDown Live in their New Years Day edition, which was his big return to WWE television, the 16-time world champion moved on to Raw six days later, where he had a big announcement.Cena officially announced that he would be a participant in the Royal Rumble match as he looked to forge a path to WrestleMania, in what sounds eerily similar to his storyline last year, where he ended up facing The Undertaker.It was a surprising reveal considering it's been reported that Cena is jetting off to Vancouver on January 20 to start filming for a new movie, and surely he can't risk to get hurt before his next project.Maybe proceedings have been delayed for now, but there's a clear plan in place for Cena going forward on WWE television.And the man who has all the knowledge when it comes to wrestling - Wrestling Observer writer Dave Meltzer - says Cena is already pencilled-in for a one-on-one match at WrestleMania 35.Per NoDQ, the man Meltzer has revealed is set to face Cena at the MetLife Stadium on April 7 is none-other than Lars Sullivan - who hasn't even debuted on the main roster yet.Sullivan is a graduate of the NXT brand, and has been advertised for weeks now that he's going to debut on either Raw or SmackDown anytime soon.That's yet to occur, but speculation is rife that Sullivan will debut in the Royal Rumble to set up an angle that leads to a match at the Grandest Stage of Them All with Cena.It would be a major risk to throw a rookie in their with such a seasoned professional, but Vince McMahon will be extremely high on Sullivan if he is going to get this kind of match, and Cena's at the point in his career where he can safely put new, young talent over to try and create new stars.WWE fans have been reacting to the rumours on Twitter, and it's safe to say there's not really a positive reaction to it.