Apparently, the new Z4 was ready to be unveiled at the L.A. Auto Show when BMW received a notice from the registration office that the name "sDrive" was already registered by the Yokohama tire manufacturer.
So, down the drain with all the preparations and no time to adjust their plans for the L.A. show so the unveiling of the new Z4 will probably be at the Detroit Auto Show in January 2009. :x
Cheers.

Cheers.