WWE Survivor Series ended on a shocking note as a mystery man climbed into the cage to attack CM Punk during the Men's WarGames match. A new report has now revealed the identity of the unidentified man.The main event of the Survivor Series: WarGames saw CM Punk join forces with Cody Rhodes, Roman Reigns, and The Usos to take on The Vision, Drew McIntyre and Brock Lesnar. While the babyfaces' team looked in control of the match, a mysterious hooded figure climbed into the cage and took out Punk with a Superkick and Curbstomp. This allowed Bron Breakker to hit the Best in the World with a Spear and pick up the win for his team.While fans have been speculating about the identity of the mysterious person, a report from Fightful Select noted that WWE sources claimed that Austin Theory was the man under the mask. PWInsider has now reported the same, noting that it was indeed the former United States Champion who attacked Punk in the main event.What's next for CM Punk in WWE?CM Punk did not have the Saturday night he would have hoped for as he was attacked by a mysterious hooded man in the WarGames match. The Best in the World also ended up getting pinned in the 5-on-5 match, which is unlikely to sit well with his teammates.Bron Breakker pinned the World Heavyweight Champion at Survivor Series, which could grant him a future title opportunity. The rising star made it clear that he wants the title when he attacked and ousted Seth Rollins from the group, and he now seems to have earned a shot at the gold.CM Punk will also have to deal with the mystery man, who is likely to be revealed as the new member of The Vision. The Voice of the Voiceless has been fighting with the heel faction for nearly a year, and the feud looks far from over. However, with Roman Reigns, Cody Rhodes and The Usos likely to go their separate ways, it will be interesting to see who will join forces with the WWE World Heavyweight Champion to take down the Vision.