Other than performance improvements and minor bugfixes, the biggest change in WS-Addressing from WSIT M1 to M2 is enabling interoperability with a publicly available release of .NET 3.0 runtime (a.k.a. WCF or Indigo). The problem was identified few weeks ago and fixed right away but this is the first milestone build to incorporate the fix.
As mentioned earlier, WS-Addressing functionality is getting subsumed in JAX-WS 2.1. If everything goes well, a subsequent release of WSIT will use WS-Addressing functionality from JAX-WS 2.1 instead of JAX-WSA. As a developer, this change will not be visible to you except that it will be a faster and better performing implementation. Read Vivek‘s blog for more details on JAX-WS 2.1 roadmap. I’ll provide more details on WS-Addressing implementation in a later entry.
Other than that, there is not much activity on JAX-WSA. Hope you are enjoying WSITing.