Canonical has recently announced a new feature called Unity Previews and this program has got tremendous potential as shown below.
Unity has already got tight integration with different online services, such as Google, Flickr, Wikipedia, Ask Ubuntu etc. What users do is to type in their queries in the dash and the lenses display the results from which users have to click on an item and open it on their web browser. With Previews, one can get more information of an item such as description, ratings, or maybe, even a full web page.
Developer David Calle has already made a Wikipedia lens that allows users to explore information right from their desktop without opening a web browser. The preview already shows much information. Screenshot below:
Think it like browsing the entire encyclopedia without even opening a webpage. Interesting.