kcollins -
My MA had e-mailed me yesterday saying the same thing that you found out your dealer, although she didn't mention the Sept. part. I spoke to MINI USA this a.m. to see if my spec changes took, and I mentioned that we were all fed up with the anthracite nonsense. He said the anthracite liner was never intended to be used in US production cars, only in other markets, but during the '05 roll out some US MA's figured out how to spec it.
Then my MA just e-mailed me the bulletin you spoke of as I have been harrassing her about getting the anthracite liner into my order (it didn't make it in earlier, although it was available at the time). It does say after Sept. no more anthracite. Until then I guess it depends on your MA and your timing if you can get it.
I attached the memo in case anyone wants to see it with their own eyes.