Went on BMW North America's web site. Why can I still "build" a 2008 Z4? Just trying to get you interested so they can refer you to a dealer to unload a leftover?
It's a possibility. The BMW sites for the U.S. of A and the Canadian site as well are not the most sophisticated sites ever created. Why they could not just display a message saying that the current gen Z4 is not available anymore is beyond me.
Instead, it seems simpler for them to just let the old code run instead of removing or updating it until the new gen Z4 appears. They may not have wanted to leave their customers with the impression that the Z4 was gone forever since there will be just a small gap of time between the end of the current gen Z4 and the introduction of the new Z4.
To be fair, its been know about for ages, talked about on here for a significant period of time, and is in line with other BMW changes (i.e. its coming up 6 years since the release of the Z4)