Yesterday, Beyoncé released a mysterious teaser for a big announcement due at 9 a.m. this morning. We hoped for a new song; we steeled ourselves for another confusing clock. It turned out to be … a Pepsi commercial disguised as a Justin Timberlake video. In fairness, the ad does contain a snippet of Bey’s new single, “Grown Woman,†and the 40 seconds or so sound promising. Money pays for art, we know, but no more six-second teasers for commercials, please. Just stick a few product-placement soda cans in there and call it a music video.