Apple has released iOS 6.1.1 beta to developers with improved Maps for Japan.
Overview: iOS 6.1.1 beta 1 includes the following improvements to Maps for Japan: ● Improved pronunciation of roads during turn-by-turn navigation ● Optimized directions to more strongly prefer highways over narrower roads ● Now indicates upcoming toll roads during turn-by-turn navigation ● Added labels for junctions, interchanges, on-ramps, off-ramps, and intersections ● Added indicators for transit station buildings, subway lines, and traffic lights ● Updated freeway color to green ● Updated icons for some location categories including fire stations, hospitals, and post offices ● Added 3D buildings including Tokyo Station, Japan Imperial Palace, and Tokyo Tower
Developers can download the update from the iOS Dev Center.