Several companies had expressed the intention of arrive to some kind of convergence in the area of Web Service Referencing and Addressing.
In an Open Letter to the W3C, 11 companies ask for "an open and honest" debate to see if there is a way to charter a new Working Group with a purpose "to define extensible and reusable mechanisms to reference Web Services, to allow such Web service references to be passed in messages, and to support WSDL Messsage Exchange Patterns". The objective is to bring convergence in the area of Web Service Referencing and Addressing as there are two major specifications, WS-Addressing and WS-MessageDelivery.
Addressing is a neural aspect in the Web Services world. WS-Addressing have been adopted by a series of technology providers and WS-MessageDelivery is a very complete specification. I think that unifying concepts between the two specifications is a key aspect for the Web Service interoperability .