Google is integrating Google Search with Social Media. Now you can share content on Google+ from the Search page itself. It has also removed the top Navigation Bar having links to +You Web Image etc with Drop-Down on Google Logo.
Here is the screenshot of the change I see. Though I cannot see the change in Chrome Browser. It is only available to me on Firefox browser.
I have resized the browser to take the small size screenshot. In the process Share button became "+" button.