Finally, it has been publicly announced!
At the PDC in L.A., yesterday the brand new Windows Workflow Foundation has been unveiled, so now we can start blogging and buzzing around it! I was playing with earlier releases since a a year ago, and it really rocks!!
Windows Workflow Foundation is the third pillar of the new WinFX, along with Windows Communication Foundation (ex codename Indigo) and Windows Presentation Foundation (ex codename Avalon). It's a programming model, engine and set of tools that provides everything you need to include system and human workflow capabilities into your applications.
For now, have a look at http://msdn.microsoft.com/windowsvista/building/workflow/ and start playing with it!
More buzz to come...