If you got a GPS unit with your car depending on the deal you made probably two or maybe more yearly updates will be made available with new maps on CDs.
Toyota came up with an obvious (now) idea:
"Map on Demand focuses only on updates for areas specified by users."And the whole infrastructure needed for that to happen (in Japan next spring) with week old updates.
Check Toyota's page in English on its Japanese site.
First at JCN. Via FarEastGizmos.