Driven from your feedback last year there is a single connected systems infrastructure track including all the web services and integration stuff.
I suppose you won't mind seeing BizTalk Server 2006 and we will see if we can oblige that request depending on how far along we are with BizTalk Server 2006 at TechEd.
How about topics related to BizTalk Server 2004. What would you like to see? Please comment on this thread to help us plan.