I am not a Bing user, so this may be usual.
I looked at a search that brought a visitor to my site.
"what is red widget"
returned an Encarta definition at the top of the page. NO need to click on a link if you just wanted a quick definition
just "red widget" returned the usual SERPS - with Wikipedia at the top, of course!
What I am not seeing any more is the Bing hosted copy of Wikipedia. Has that gone?
I also noticed that Bing is using Wolfram Alpha for some things. I am not quite sure what apart from drawing graphjs from equations.