A new update for offline Maps are now available for Windows Phone 8 devices. We have confirmed that both Nokia and other OEM devices are getting this update. Windows Phone 8 brought in the ability to update the downloaded offline maps whenever available. You can go to Settings->Applications->Maps->Updates to install them. Installing latest Maps will bring you the latest local map tiles, POI data, etc, to your device so that you can be always up to date even when internet is not available.