This post originated from an RSS feed registered with .NET Buzz
by Dave Bettin.
Original Post: Sorry, Virgina There is No Pub/Sub
Feed Title: Dave Bettin on Services
Feed URL: http://www.davebettin.com/me/rss.aspx
Feed Description: Bettin' on .Net Service Development
So, there will be no WS-Eventing in the first release of Indigo [1]. That is fine with me, I would rather have the product shipped then wait on this feature.
I have heard some people say that the WS-Eventing specification is trivial. Which is true, however, it is the reliable and scalable implementation of the specification that can lead to some significant challenges. With that said, I still believe we will see some sort of a Pub/Sub  sample when Indigo is released or soon after. It will just be lacking the quality that we would have seen if it was a core Indigo V1 feature.
[1] - There is an interview with Don Box at VSLive - SF on Longhornblogs where he talks about the slicing of pub/sub in Indigo V1 and other Indigo tidbits.