SONIC® Drive-In introduces all-new Dunked Ultimate Chicken Sandwich   OKLAHOMA CITY, 2017-Jul-27 — /EPR Retail News/ — SONIC® Drive-In (NASDAQ: SONC) is adding to its robust chicken lineup with the introduction of the all-new Dunked Ultimate Chicken Sandwich featuring an innovative blend of bold flavors to a guest favorite. SONIC's Dunked Ultimate Chicken Sandwich features a flavor-loaded, quality chicken sandwich…