Good news! Microsoft Patterns & Practices has released both Enterprise Library 5 Beta 1 and Unity 2 Beta 1. There are lots of changes to make Enterprise Library and Unity much easier to configure and use in your .NET Applications.
Here are useful links to get you started on EntLib 5 and Unity 2:
You can run both Enteprise Library 5 and Unity 2 alongside Enterprise Library 4.1 with no problems.
Here are a few Unity 2 Tutorials and Enterprise Library 5 Tutorials I have already written if it helps:
Enjoy!
David Hayden