Here is the current unofficial roster for WWE '13, according to The Wrestling Observer. CM Punk, John Cena, Brock Lesnar, Chris Jericho, Triple H and The Rock are amongst the modern era superstars included in the game.
Mike Tyson is also in the game as an Attitude Era superstar.
You can check out the unofficial roster below:
Modern Era Superstars: CM Punk, John Cena, Sheamus, The Rock, Triple H, Undertaker, Mark Henry, Chris Jericho, The Big Show, Brock Lesnar, Kevin Nash, Kane, Alberto Del Rio, Booker T, Brodus Clay, Christian, Cody Rhodes, Daniel Bryan, Dolph Ziggler, Sin Cara, Epico, Heath Slater, Kofi Kingston, Hunico, Jack Swagger, David Otunga, Jinder Mahal, Justin Gabriel, Primo, R-Truth, Randy Orton, Rey Mysterio, Santino Marella, Ted DiBiase, The Great Khali, The Miz, Wade Barrett, Zack Ryder, Beth Phoenix, Kharma, The Bella Twins, Eve Torres, Kelly Kelly and Alicia Fox.
Attitude Era Superstars: Steve Austin, The Rock, Triple H, Undertaker, Shawn Michaels, Bret Hart, Eddie Guerrero, Edge & Christian, New Age Outlaws, Road Warriors, X-Pac, Vince McMahon, Shane McMahon, Stephanie McMahon, Mankind, Dude Love, Cactus Jack, Trish Stratus, Lita, Big Show, Kane, Davey Boy Smith, Vader, Mark Henry, Ken Shamrock, Godfather, Big Bossman, Mike Tyson.
UPDATE 1: The roster above is the unofficial roster. The official roster from THQ currently consists of the following eight Superstars: CM Punk, Steve Austin, Sheamus, The Undertaker Mark Henry, Mankind, Chris Jericho and The Big Show.
UPDATE 2: We have updated the list with the roster listed in The Wrestling Observer. The Attitude Era Superstars list is identical to the original list we posted, however the modern day superstars includes Alberto Del Rio, Brodus Clay and Booker T.