Mauricio it's good that will be provided an integration with Mule but what about JBoss ESB?
IMHO the future of jbpm5 must be inside a soa platform and the next one must be integrated with jbpm5.
So I think it should be considered primary to integrate jboss esb and jbpm than jbpm and mule.
About the task list; working with customers during these years I always faced the problem to build a web application for task list; basically the jbpm task list can be good but the customers wants for example remove red hat logos or use its own css.
So I don't ask too much :-)
Giovanni