John Cena is serving time out of the WWE, However, he is always expected to return. When he will return he could come face to face with Drew McIntyre.
Source: WWe
CM Punk is back and while it seems he will embroil in a potential feud with Seth Rollins. But a one-on-one contest against Randy Orton, to turn the time back, will blow the roof.
Source: WWE
The Rock vs Roman Reigns is a rivalry that WWE universe is looking forward to. However, when it will take place is anybody's guess.