Just over a week after iOS 6.1 was released publicly, Apple has released iOS 6.1.1 (build  10B311) for developers and it includes some map improvements for Japan. The release notes share the following:

• 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 colour 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

For any users with a jailbroken iOS 6.1 device via the evasi0n jailbreak, you are urged to stay away from this update according to @musclenerd. The update most likely secures the exploits used in the iOS 6.1 jailbreak, which Apple recently warned users to avoid:

6.1.1 beta is already out to developers! Obviously stay away from that.

— Ⓜ MuscleNerd (@MuscleNerd) February 6, 2013

iOS hacker @iH8sn0w says this beta has no expiry date, unlike previous releases in the past.