To make Olive Tapenade, combine all ingredients in a bowl; let sit for 5 minutes to blend flavors. Can be made ahead.
Slice pretzel rolls, spread Olive Tapenade on bottom of each roll. Top with mortadella, capicolla, salami and provolone cheese. Add top half of roll and press together. Sandwiches can be served immediately, but flavors blend if sandwiches are individually wrapped and refrigerated for up to 8 hours.