In December we reported some signs of a new test of something called Quick View within the Google mobile search results.
Well, Google has confirmed that this is a test yesterday on their search blog and on Google+. In short, the Quick View "badge," as Google calls it, is only available on US english results now for Wikipedia pages.
Some searches also include a blue "Quick view" badge to the right of the results. For example, if you're learning poker and want a quick lesson on hands, search for [poker hands] and click "Quick view" for a quick look at the Wikipedia page for poker hands. Quick view is currently an experimental project and only enabled for Wikipedia pages when you search in English on Google.com. Stay tuned for updates as we work to expand this to additional websites.
Here are screen shots of how it works:
The landing page:
To sign up to use Quick View, use this form.
Google also confirmed the sub-sitelinks.
Forum discussion at Google+.