Until now, Google offered two ad serving products for publishers “Google Ad Manager, for growing publishers, and DoubleClick's DART for Publishers (DFP), for large media companies with complex needs.” Now, Google launched the “DoubleClick for Publishers (DFP),” a new platform that offers an even more intuitive workflow to help publishers of all sizes manage campaigns quickly and easily, while providing access to sophisticated feature set including advanced reporting, forecasting, and optimization capabilities. “In coming weeks, all Google Ad Manager publishers will automatically be upgraded to DFP Small Business and we’ll be working closely with DoubleClick customers to upgrade them to our premium platform on a schedule that makes sense for their business. New publishers signing up for Google Ad Manager will be automatically upgraded to DFP Small Business on same schedule as current GAM publishers,” stated Google. Also, the new version of “DFP comes with a modern API that enables publishers and third-parties to customize and extend the product,” more info here.
More info: upgraded ad serving platform