Even though Firefox has added this feature months ago with Firefox 14, better late than never.
Google Chrome, starting with Chrome 25, will use HTTPS for ALL Google searches by default. This change should enhance privacy, at least packet wise. Those who are using a public or otherwise insecure network will appreciate the change, as data packets between you and Google will be encrypted.
Previously, HTTPS searches were only used in Google if you were logged in to Google. With this change you can now be logged in or out, and still have HTTPS functionality.
However, this change just encrypts the connection between Google and you, and does not affect the data that Google records about searches. And of course, you can always use other search engines, such as DuckDuckGo, which offers HTTPS functionality and is dedicated to privacy.
Now, all I am personally waiting for is HTTPS functionality in Bing. I don't know what's taking them so long, but all of their competitors are ahead of them in terms of offering better privacy in packet exchange.