Triple H after WrestleMania kickoff press conference announced that Roman Reigns would defend his title against Cody Rhodes at WWE WrestleMania 40.
The Rock is also seeming interested in wrestling at WWE WrestleMania 40. During the WrestleMania press conference it was visible that The Rock has turned heel.
WWE recently released WWE WrestleMania 40 teaser. Only four wrestlers were shown in the teaser. Roman Reigns and The Rock were staring Cody Rhodes and Seth Rollins.
It might be possible that Roman Reigns and The Rock could team up to face Cody Rhodes and Seth Rollins at WWE WrestleMania 40. If that match happens then it would most likely on Night 1 of WrestleMania 40.