Yes, in the future you will be able to consume and visualize vector tiles locally in an iOS application, either in the form of bitmap fragments, or directly in a vector context (for example, OpenGL). This is under construction.
This is less about sources such as SVG or PNG, and about the open vector format that Mapbox will serve modern OpenStreetMap data and later, other sources for these uses.
To experiment with vector style, preview the TileMill 2 preview . Stay tuned for iOS.
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