Enterprise Library 5.0 is under development NOW 

It’s a shame this year’s Microsoft Developer Days does not cover anything of the work the Patterns & Practices team is doing. However I know from first hand that they’re doing a very good job. A few weeks ago, you were given the opportunity to vote for your favorite feature or improvements, and now, they’ve delivered their first drop. And while you’re reading about it, notice that P&P is actually using (a variation) of SCRUM, hence their reference to Sprints.