Who explains this better than Google
See also http://marketing.blurgroup.com/blog/...es-and-tips-2/
This is an extremely comprehensive in-depth analysis of Enhanced Campaigns.
The Havis Media Group
also wrote a great article pertaining to Enhanced Campaigns.
Mobile (primarily smart phones and tablets) are being used by consumers more and more to research info on products and services before they make a purchase. Enhanced campaigns integrates those devices into what was once (or still is until Monday) AdWords campaigns.