Now that the search industry had some time to digest the news and here are some quotes from the WebmasterWorld thread:
Each page view with a search "powered by Bing" will be a tiny advertisement for Bing. Google will be hit hard by this. Finally, Google gets what it deserves, after having ignored important needs (like transparency and privacy) from publishers and webusers for so long. What joy!
I would have serious issues with FB if I knew Google had access to the FB data coupled with their famous virtually non-expiring, unique tracking cookie.
Forum discussion at WebmasterWorld.