The next release will inlcude the following:

-         Collections support in the Unity Application Block (Unity dependency injection container)

-         Improved support for generics in Unity

-         Interception mechanism in Unity (including integration with the Policy Injection Application Block)

-         Improved type picker of the config tool (this one needed a face lift for a long time)

-         Debugging visualizer (to allow for easy navigation of mappings, corresponding lifetime policies as well as container extensions).

  Here is the post:

http://blogs.msdn.com/agile/archive/2008/08/03/entlib4-1-kickoff.aspx