Google testing More Info button in SERPs

Google is testing a new "Click for more information" button in search results. Clicking on the "+" button will expand the search result with a few lines containing more information and a Search Site form. See the screenshots below.

Searching for "Google":

Google Earth expanded:

Google expanded:

Search results for "hotels":

Note: In case you're wondering about the "Save" and "History" links, those are added by the Customize Google Firefox extension.