Bing's new HTML5-and-CSS3-enhanced search interface, which was first demonstrated back in September 2010 to showcase the power of IE9, has started to roll out. WinRumors is also reporting that a feature reminiscent of Google Instant search is being added to Bing, with page elements smoothly transitioning in and out as you type in your search query.
New Bing UI
The most notable addition to the new interface is is smooth page transitions -- the fade in and out -- and navigation tabs (maps, images, videos, etc.) now persistently float at the top of the page.
If you want to try out the new Bing UI, just wait a few days until MIX 2011, Microsoft's Web developer conference, which is when the new Bing UI should be officially launched.