It was previously reported that WWE officials were talking about a possible John Cena vs. Bray Wyatt match at WrestleMania 30, possibly even in the main event of the show. It's now being reported that that match probably will not happen at WrestleMania 30.
One scenario that was being discussed a few months ago was having Bray Wyatt win the Royal Rumble Match and then challenge Cena for the World Heavyweight Championship at WrestleMania, but this was before WWE decided to unify the World Heavyweight and WWE Titles together. Now that there is only one Unified WWE World Heavyweight Champion, all talk about that match has been scrapped.
As of right now, Dave Batista is still expected to win the Royal Rumble and go on to challenge whoever the Unified WWE World Heavyweight Champion is at WrestleMania. Randy Orton is still expected to be the Champion heading into WrestleMania.
As for Cena and Wyatt, there is still a chance that they might have a feud at some point down the line, but as of right now they are not expected to compete against each other at WrestleMania 30.