From Google Analytics Blog:
Google Analytics Blog: Making search more secure: Accessing search query ...: As search becomes an increasingly customized experience, particularly for signed in users, we believe that protecting these personalized sea...
How will this change impact Google Analytics users?
When a signed in user visits your site from an organic Google search, all web analytics services, including Google Analytics, will continue to recognize the visit as Google “organic” search, but will no longer report the query terms that the user searched on to reach your site. Keep in mind that the change will affect only a minority of your traffic. You will continue to see aggregate query data with no change, including visits from users who aren’t signed in and visits from Google “cpc”.