So far no letter here. However I just moved and my mail has not yet forwarded. Also I have a July '11 build so it looks like I'm not covered by any of these.
Here's hoping I got some updated parts/software already.
FYI just did a 5 day 2500 mile cross-country trip in the 335d and she performed spectacularly. Got about 38 mpg and not so much as a hiccup.