@Sensei
I think that image is a fake. why you ask?
Bing does not have an autocomplete feature like google. It only suggests things you've previously written in.
This is simply not true. I almost never use bing, and I have certainly never typed in "the xbox one is amazing" and yet when I went there it auto completed to that.
Two things are notable:
I am using a noscript, and unless I let bing though it can't autocomplete. And the same for google, but google is allowed to run by noscript by default. Perhaps you also have a script blocker that allows google but not bing?
Additionally, if you just leave out the word 'is' bing auto completes it relatively equivalent to google, terrible going to fail ect. Also it gives more then one autocomplete, where the is only gives one for some reason.
I don't know, it certainly could be intentional, which would explain why only the very specific addition of is works and why it only gives one option. On the other hand it doesn't really make sense if they were going to do it to limit it to such a specific thing as that adding one word changes it, additionally adding is to other searches also sometime has other odd effects on bing, removing or changing autocompletes even when one would think it would not.
I think it is most likely that it is just a quirk in how bing handles words like 'is'.
Edit: This post brought to you by the word additional and the number $.