It's main difference for users is a shift from a "keyword" focus to a "sub-category" focus. As stated in DirectNews: "A search for 'Britney Spears' may organise by the subcategories 'biography', 'videos', 'music' and 'concert information',"
This may have an effect on how marketers optimize their sites for BING.
For more information, check out the following articles: