We have just acquired an ESB to seed the product. Check out my blog entry (http://jboss.org/jbossBlog/blog/mlittle/2006/06/15/JBoss_acquires_enterprise_ready_ESB.txt)
I'll post more here later, but this doesn't change anything we've been doing and discussing: it just makes it a lot easier for us to make progress.
I'd like to spend a moment and thank the community members of the ESB team: without you guys we'd not be as far along as we are so far. I'm hoping that with the acquisition of Rosetta, we can all make much more efficient use of our time and get an ESB out that closer to our collective visions sooner than we though.