Available sometime in 2008.
Future releases of BizTalk will use the .Net WF engine - just imagine the possibilities. A free workflow engine that integrates with ARIS and can run on the desktop, app server, web server, SharePoint, MS Office & integration tier. Not to mention the army of .Net developers in the market gaining experience on .Net WF development and the wave of blogs, code, wiki's and training available.
Cross posted from www.davidstrommer.com