It sounds like the WS-Eventing Workshop was a great success. Jorgen just had us post the overview on MSDN which includes all the slide decks.
You might want to check out Jorgen's earlier post on the workshop.
There is also a yahoo group to discuss the spec at http://groups.yahoo.com/group/ws-eventing-workshops/.
I also think it is worth noting that although people like IBM were not on the original spec, they did attend the Workshop and I'm sure their voice was heard.
Of course the real question is whether or not it lived up to all the hype?