NewsFlash...Microsoft today announced their long-awaited entry into the Complex Event Processing market. The press release is at http://www.microsoft.com/presspass/press/2009/May09/05-11TechEd09PR.mspx. The news was also announced by Bill Veghte as part of his keynote at TechEd. The Microsoft CEP offering will be delivered as part of SQL Server 2008 R2
Unfortunately, this is the only information I can find so far in the public domain, and, being a cautious kind of guy, and NDAd up the hilt, I will hold back from saying more until I can guage just how much detail Microsoft is releasing at the current time. It looks like they have a session at TechEd tomorrow on their forthcoming offering. There was talk a few weeks back of an early public CTP, but there is now some suggestion that this may not be available until later in the year. Watch this space for more info.
In the meantime, here are a couple of Microsoft Research links that you might find interesting. I couldn't possibly say how relevant they might be ;-)
http://research.microsoft.com/apps/pubs/default.aspx?id=70517
http://middleware05.objectweb.org/WSProceedings/demos/d1_Barga.pdf