WWE has featured developmental talent Dean Ambrose as a member of the main WWE roster in the new WWE Souvenir Program, which is sold at WWE's live events. This would seem to indicate that Ambrose could be on the verge of being called up, or it could just be a mistake. 

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As of right now, Chris Jericho is not being advertised for any WWE events after the SummerSlam pay-per-view. It's been well-documented ever since his return in January that he would probably be taking a temporary leave at some point during the summer, but these reports have changed many times over the past couple of months. But either way, the general consensus has been that even if he does leave, it won't be for good and that he will almost certainly be back, possibly even by the end of 2012.