There's a slight chill creeping into the air, signaling the return of everyone's favorite seasonal flavor — yes, it's true, pumpkin spice is on the way. In a press release, Dunkin' announced the arrival of Dunkin' Spiked, "a buzz-worthy twist on a quintessential fall classic and Dunkin's highly anticipated seasonal offering: the Pumpkin Spice Latte." The product will be sold …