When you build websites to rank on Google, it automatically is rankable on bing, because they follow a similar algorithm. The thing is with every update, Google is trying to show the world that they are for the motto "the best information on the web", but in doing the show they have started to rank vague news sites for important terms.
And this isn't going to stop. If your site is ranking on Bing then very good, but you can't go about ranking on Bing as a stand-alone thing because there isn;t much of a difference.