Windows Workflow Foundation (WF) as well as designers therefor, such as the Visual Studio 2005 Extensions for Windows Workflow Foundation, will surely continue to evolve.
There is currently no reference material available regarding what such future evolutions would contain. Visio integration has been identified as a an area where we are looking to partners to provide solutions/extensions for the designer(s). Microsoft may or may not choose to provide such functionality at a later point, however it's still too early to say if (and if so when) that could be. At this point, we're still maintaining our tool set as primarily developer centric.
Anna Lidman - MSFT
Lead Program Manager | Connected Framework (WCF, WF) | Community & Release Mgmt |