This is for several reasons. With EP60 it is now possible to develop on a central instance of EP and also to develop against webservices. We currently evaluate concepts how to achieve automatic referencing in Eclipse for central instances of EP60 and Webservices again.
Therefore we created a workaround in your PDK role “Java Developer” under download, you may download the most important EP libs to your local desktop. (After clicking and saving “libraries.zip” you must rename it to *.zip) .
Sorry for the unconvinience, we will improve this in upcoming SPs.