SONIC® teams up with Paramount Pictures and upcoming film Transformers: The Last Knight for new lineup of icy Slushes   Guests to "Transform Your Summer" with refreshing Slush lineup and sweepstakes OKLAHOMA CITY, 2017-May-31 — /EPR Retail News/ — SONIC® Drive-In (NASDAQ: SONC) is teaming up with Paramount Pictures and the upcoming June 21 theatrical release of Transformers: The…