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Re:Leaked screenshots of native Google Maps (Alpha) for iOS 6 by ooobo on Sunday October 14, 2012 @04:07AM (#4650972)
iPhone 4 is missing the 3D flyover, but it most definitely has turn-by-turn.
Re:Leaked screenshots of native Google Maps (Alpha) for iOS 6 by Firehed on Sunday October 14, 2012 @04:36AM (#4651021)
No. Source: http://www.apple.com/ios/maps/ (also, the iPhone 4 sitting two feet from me).

Maps has had driving directions since 1.0, but only the latest and greatest maps app on the 4S and 5 (and the latest two iPads) do turn by turn.