Gird thyself, a new Windows approaches. Tomorrow morning in San Francisco, Microsoft will show off some part of its next operating system in a long-awaited event whose existence leaked before it was formally announced. The market is expectant, and the technology and business media will have its eyes trained on what Redmond has on offer. In the past few days, odd rumors have cropped up: Will the technical preview be ready to go, or released several weeks after the event? Does the code even have a formal name? We’ll find out soon enough.