While you would have expected the WWE to have plans in place for Roman Reigns, headliner of the past two WrestleManias, the WWE does not have a plan in place, despite being about 100 days from WrestleMania 33.
Dave Meltzer of The Wrestling Observer has mentioned that the Royal Rumble could see Roman Reigns winning the WWE Universal Title from Kevin Owens, with Jericho suspended in a shark cage.
As for his WM33 plans, Meltzer noted that there are different ideas being discussed for Reigns, including a huge surprise, that's probably not happening (Reigns vs. The Rock?).
Overall though, plans for Reigns are still up in the air for WrestleMania.