At the main menu, select "My WWE", "Options", then "Cheat Codes". Enter one of the following codes to unlock the corresponding bonus.

John Cena Street Fight gear
Enter "SLURPEE" as a code to unlock the John Cena Street Fight gear.

Randy Orton alternate attire
Enter "apexpredator" as a code to unlock the Randy Orton alternate attire.

Tribute To The Troops arena
Enter "8thannualtribute" as a code to unlock the Tribute To The Troops arena.