Well, I think I found my favorite new feature. We now have a drag and drop designer for Analytic Charts in CTP3. Basically you create a blank chart and connect to a data source. In the Details Pane, you will see a list of measures, dimensions and namesets available within that data source. Then you just drag and drop them to build your chart. Pretty straight forward.
Now, if Microsoft would hook this to NON OLAP sources, then they would have a touch down!!