If you're really interested, PM me. BMW's DVD maps are now on version 2008-1 maps...but, like the others said, it is quite expensive $$$. But, if you ask me, the money spent on this conversion is satisfying, especially when everything is integrated with i-Drive system. "money well spent!!!"
Just to correct the statement, it's not an update, but a CCC conversion from Jap Spec to EU Spec. (MD CCC ---> DVD CCC)