No.
You can let users choose between iOS cards and other cards (OpenStreetMap, Microsoft VirtualEarth, CloudMade, OpenAerialMap, OpenCycleMap, SpatialCloud, TileStream7) using the me route (on github) or you can go with Bing cards (a library is also available).
But you will have to code different libraries, since the MapKit Framework is only available for Apple maps in iOS 6.
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