Source: The Wrestling Observer
At this time, there is talk of The Undertaker and Kane teaming up to take on The Shield at SummerSlam. Undertaker was recently written off TV following a beat down by The Shield. The company would like to run some form of payoff angle and feel that the SummerSlam PPV would be the best place to do that.
Nothing is written in stone at this time and WWE isn't sure if The Undertaker will be ready to go. It was reported on Monday that Undertaker is scheduled to get surgery on his right shoulder and his left hip, and has promised to be ready for WrestleMania XXX.