BMW still support CD maps for CD based systems, so the most recent map will be a 2010 map

Slight variations occur depending on issue dates and regions concerned: some regions have maps issued twice a year, others yearly, others once every 2 years

So if you are sliglty too early for the 2010 map, then guarranteed there is a 2009 map available.

Ask at the official supplier for your region, which generally is BMW...