"As search becomes an increasingly customized experience, we recognize the growing importance of protecting the personalized search results we deliver. As a result, we're enhancing our default search experience for signed-in users. Over the next few weeks, many of you will find yourselves redirected to https://www.google.com (note the extra 's') when you're signed in to your Google Account. This change encrypts your search queries and Google's results page. This is especially important when you're using an unsecured Internet connection, such as a WiFi hotspot in an Internet cafe," explains Google.
Right now, https://www.google.com no longer redirects to https://encrypted.google.com and Google no longer informs users that they're using Secure Search. It's important to keep in mind that no other search engine offers this feature and SSL has a performance penalty, which means that search results pages will load slower. This is especially noticeable when you use Google Instant and the results won't show up as fast as before.
After the security incident from December 2009, Google went to great lengths to make its services more secure. Most services that require authentication default to SSL and many no longer offer unencrypted versions. It's interesting to see that Google Search will be treated just like Gmail, Google Docs, Google+ and other services that store user data even if this change won't make too many people happy (users will complain that search results pages load slower, webmasters will complain that their logs will be less useful, AdSense ads from search results will no longer be able to use the Google query and fewer users will click them, companies won't be able to monitor their employees' Google searches). Google already offers some solutions that address these issues: webmasters can use Google Webmaster Tools to find the most popular Google searches that sent users to their sites, while network admins can try the NoSSLSearch option.
It's an important change, but I don't see why signed-in users should be treated differently and why protecting user queries outweighs the drawbacks mentioned earlier. One of the explanations could be that search will no longer be a distinct service and will integrate with Google+, Gmail, Google