I read MapBox and vector tiles and am wondering if I understand this right.
In some future it will be possible to render vector based tiles with iOS MapBox? If yes, how would the RMTileSource for vector tiles look like?
In layman's terms, do I understand this right: I will be able to use a SVG or even PDF files as the data source for MapBox instead of PNG tiles?
If yes, is there any code out yet that I can experiment with?
Yes, in future, you will be able to consume and render vector tiles local to an iOS app, either as raster tiles or directly to a vector context (e.g. OpenGL). This is in development.
It's less about sources like SVG or PNG and more about the open vector format that Mapbox will serve up-to-date OpenStreetMap data and later, other sources, for these sorts of uses.
To experiment with vector styling, check out the TileMill 2 preview. Stay tuned for more iOS-specific stuff.