Due to a bug while upgrading version 1.0 to 1.1 on the device, the map list is not refreshing to include the two new bonus maps at the end.

You can force the map list to regenerate by deleting the app first, and then downloading it again from the App Store, or syncing it over from your iTunes Library.

Version 1.1.1 (under review by Apple currently) will fix this problem.