No big deal and actually quite self explanatory. For more information on the issue please consult the Official Google Blog. Unfortunately the new search options/ filters are not available for Austrian or German users. Thus I recommended using the US website of Google to test the functions.
Interesting features, complementing existing features as e.g. the Wonder wheel, to be rolled out soon are: More shopping sites and Fewer shopping sites, Visited pages and Not yet visited (requires web history), Books, Blogs and News.