In its blog post on the subject, the Bing team describes this as the most significant update to Bing since we launched three years ago. They’ll be phasing it in over the next few weeks. So what can we expect? Danny Sullivan got a preview of the new features to try out. He noted that the new design featured three columns with Core Search, Snapshot and Sidebar panes. It comes across as a very functional design, and a surprisingly useful way to incorporate the social graph into search. For example, let’s take a look at the Social Sidebar. It presents as a vertical gray sidebar to the right of y…