WinRumors expects it might be sometime around the launch of Internet Explorer 9, which may be around March 24th.
We know 80% plus are looking forward to the new Bing HTML5 interface.
The Bing Preview page at bing.com/peek is now currently blank, although the other day it cited changes and screen shots.
Features coming in the HTML5 version include:
- Animated background images for the core Bing search page.
- Instant search results.
- Smooth search history navigation.
- Automatic slideshow creation for media searches.
- "Hover window" previews of sites.
Forum discussion at WebmasterWorld.