Russian site iGuides reported on the new functionality, at least for those running the jailbroken version of the 2010 Apple smartphone.
To get it to work, you'll need the iOS 6 beta, the early jailbreak, and Titkov's 3DEnabler app. Turn-by-turn navigation remains elusive, however.
Another caveat, of course, is that the early iOS 6 jailbreak provided by the iPhone Dev Team is just that: early. It is early - and buggy. The team said that the jailbreak is so early they are calling it a developer-only version.
Ah, but you do get 3D mapping.