Open the Apple Maps app in iOS 6, tap the bottom right page curl, and enable Satellite view. All of a sudden whatever you’re looking at will be filled in with realistic details like grass, pavement, and buildings. The Google Maps for iPhone app is capable of displaying satellite imagery as well, but Google has also baked a hidden topography mode into the app.
Thanks to jailbreak tweak developer Ryan Petrich, there’s a new package in Cydia that unlocks the Google Maps for iPhone Topography mode.