Here's the key fob that was shown to me for the i8. It had a paper tag on the key chain that read "i8" in handwriting (not shown).
BMW i8 Key Fob by
ddk632, on Flickr
So hopefully this is a backup key or a temp/pre-production key, but 2 people at the show told me this is actually the production key.
EDIT - update - the key thing has been resolved and the key I was shown in LA was a temporary key, as confirmed by scott26 and the BMW I brand manager. See this thread for more info:
http://bmwi.bimmerpost.com/forums/sh...d.php?t=922608