The Undertaker and Sting will be part of the advertising for the 8/23 WWE Summerslam PPV in Brooklyn as they are currently scheduled for the show according to multiple wrestling media reports. It is unknown as of this writing what role Undertaker and Sting will have on the show and any other upcoming dates they are scheduled for, including this Sunday’s Battleground PPV in St. Louis.
Sources: The Wrestling Observer/Figure Four Online, PWInsider.com