Gamestudio on iPhone?
That would require a major redesign, and result in very slow
apps, when users use the same approach in making games as on the PC.
Mobile Phone development is much more performance critical,
and by this requires a much more low level programming approach
and asset creation / formats.

I dont see Gamestudio as a solution for iPhone,
without making a whole new Gamestudio architecture.
You cant use the same methods and asset-formats for mobile development.