Movie theaters are girding their loins for the arrival of “The Devil Wears Prada 2 ” this weekend. The long-awaited sequel from 20th Century Studios has made $10 million at the box office in previews. It’s projected to earn between $75 million and $80 million in its opening weekend, but some estimates put it even higher at $90 million to $100 million due to the popularity of the original and the recent over-performance of Lionsgate’s “Michael.” Internationally, “The Devil Wears Prada” sequel