I have just updated the APEX Statement of Direction and refreshed the APEX 4.0 Presentation.
One of the big new additions is Team Development (as some caught onto with my last blog) including Built-In Feedback. This came out of our work with Teamspace - a stand alone packaged application with some of the same sorts of capabilities. Due to development constraints the Teamspace packaged application has been put on hold for a short while.
Check out the presentation for a few more details on many of the major 4.0 features.