All new cars will get badges, and service centers will get supplies to apply for all existing owners who ask. See the Bulletin board. However, it's not clear if you can get an extra, so you can wear two at once. Who will be the first to ask?
With the hope that it will be like money that's minted with a flaw that becomes super valuable years later because it's rare, I don't think I'll be badging my Model S as only the first few thousand came out unmarked.
Silly, I know.
@Cattledog - It's easy enough to de-badge a car, many modders do it. So it would be easy to forge a de-badged car. :-o