Today, Google has changed its interface across all application. It has introduced a new design for top bar with black background.
Also, in some cases it is showing a new search button in blue along with a magnify glass icon. And there are no separator line between left panel and the search result which use to be there earlier. Also, the menu items on the left side panel have completely new icon set with more of black and gray stuff.
Google has introduced a new feature today in their search results. After search results appear, you can choose the search results to be shown in small, medium or large details. This feature was got visible only in Google Chrome, when tried the same search in Internet Explorer or Firefox it did not appear.