This year's WWE SummerSlam is a four hour event, making it the biggest summertime spectacular in the event's 28-year history. WWE is hoping to make it the "WrestleMania of the summer" by giving it that extra hour and it will also allow them to add a few more matches to the show as well. With a main event math like The Undertaker vs. Brock Lesnar already set, the expectation is that this could be one of the best SummerSlam's ever. Even though their match at WrestleMania XXX wasn't that great (you might have heard that Lesnar won that one), they got off on the right foot when they rekindled their feud by having an amazing brawl on the July 20 edition of Raw. Some might say that the rest of the card really doesn't matter because of how good that Undertaker/Lesnar brawl was. When Lesnar yelled out "I'm gonna kill you" and Undertaker replied with "you're gonna have to" it sold the show right there. Of course, the rest of the card does matter, and WWE will do everything they can to put on an amazing show for the Brooklyn crowd and those watching via the WWE Network. Like you would expect for a major show like SummerSlam, there are all kinds of rumours about what may or not happen on August 23 in the Barclays Center. With that in mind, here's a look at ten of the biggest rumours surrounding SummerSlam 2015.