CHICAGO (AdAge.com) -- Starbucks aired the first creative for its Via Ready Brew during the season premiere of "Saturday Night Live" last night. Four 15-second spots from agency BBDO, New York, challenged consumers to a taste test at its cafes this week, to discern the difference between its much-lauded instant product and the Starbucks house brew. The company wouldn't confirm details about the upcoming national advertising campaign for Via, other than the official launch date, this Sept. 29. An executive familiar with the matter cautioned that "SNL" creative may not reflect the look and feel of the upcoming campaign. The...