WWE set the WWE World Heavyweight Title match up for Wrestlemania 31 with the finishes at the 2015 Royal Rumble
Brock Lesnar will defend the title against Royal Rumble winner Roman Reigns
The other matches, while not announced, appear to be falling into place as well. These matches are expected to be part of the event:
WWE World Heavyweight Title
Brock Lesnar (c) w/Paul Heyman vs. Roman Reigns
John Cena vs. Rusev w/Lana
Triple H vs. Sting
Seth Rollins vs. Randy Orton