Ever since Anna Wintour's third decade atop the masthead at American Vogue began in June, rumors of her imminent retirement have intensified. Signs offered in support of this include the fact that her contract is ending, the shuttering and/or draw-down of spinoff titles Men's Vogue, Fashion Rocks, and Vogue Living, and the fact that competitors have been weathering the downturn better, as measured in ad pages. A new twist came in the form of news Wintour could be getting replaced. By Carine Roitfeld, her Vogue Paris counterpart. While it sounds like a tale right out of The Devil Wears Prada, if there's any merit to the rumor, big changes will be ahead for the title. An examination of the differences between the spunky Parisian and the chilly Brit, and a round-up of why la Roitfeld might just knock some cool into the stuffy luxury mag, after the jump.