"Haven't you read the feature list and the discussions concerning P5 ???
The library system is one of many new improvements...
How about the ability to develop hair.
The fact Pro PAck is integrated into P5...for those that did not buy PP..they now have it...minus the plugins-, but they're on the way.
Face Room...use photos, face sculpting, etc etc
the new renderer--hybrid micro-polygon and Ray Trace render engine with subdivision surface rendering of polygons.
Dynamic Cloth..."

Dave, stop. I'm getting excited. :) Mine won't be here till next week sometime.

...... Kendra