You can find an interesting article about code name WinOE from "WinOE Workflow Prepped For Whidbey, Longhorn, Office 12 In 2006"
. I have no idea of WinOE itself, but if it supports the current orchestration features as well as ad-hoc workflow in one integrated engine, it will be great improvement of this area.
I really hope that we can have just one pervasive process abstraction layer for all kinds of software. :-)