Google today announced there will be a new source line item for image search reflected in Google Analytics which will display as ‘google images’ in the Source report and ‘google images / organic’ in the Source / Medium report within Analytics.

Google this month announced it  will roll out a new referrer URL specific to Google Images over the next few months. This is to help webmasters "to understand the role Google Images plays in driving site traffic." The referrer URL is part of the HTTP header, and indicates