talk to my service manager. At some point Mass will get the diesels, they just haven't completed/passed testing. But they don't know when, so conceivably, it could be forever. But with VW coming out with a quite a few diesels in their new lineup, you can bet that they will do everything they can to sell in all 50 states.
Expect it to be at least 2006. You know what they say: "Garbage in, garbage out". In this case, garbage diesel. Plus it sounds like CA emissions requirements are going to be getting very unfairly harsh against diesels. Probably harsher on particulates than greenhouse gases. But with the better diesel the nice new clean diesel engines will hopefully be making it to all states.