Rated 4 out of 5 stars
I think this is an awesome idea from IE. Does right clicking the search icon allow you to select the search engine?
Edit:I see it just fills it in to the default home search engine page. I think this is a bad idea. I think hitting enter on a word(s) typed in the url bar should run search on the currently selected search engine. The search engine icon should be shown at least as a background of the magnifying icon, also right clicking the magnifying icon should allow to change the search engine. Also should be able to change the search engine by holding ctrl + down/up arrow, just like you can in the regular search bar.
Also now that the search bar is unified with this, live search results/suggestions of the currently selected engine (if the engine has live results/suggestions) should be shown in in the suggestions area of the url bar.