Is there a built-in solution using Google Maps in iOS6 ? Let not be assumed UIWebView.
UIWebView
Do you think developers will use Apple cards because they don’t want to use them UIWebView?
In iOS 6.0, you will have to use UIWebView (the Google map display engine is missing as before), this may change in the future, but this is not very likely because Google and Apple no longer love each other.
How about using layered map boards on top of Mapkit? See link