Is it possible to compile Sprite Kit (new feature with XCode5) app/game for iOS 6? I have compiled Application for deployment target iOS6, tested on simmulator but i dont know if it will work on physical device.
I would say that this question violates the NDA, but this can be answered in a general way: NO, you cannot. Apple frameworks are dynamically linked. What this means is that each version of iOS comes loaded with specific libraries from Apple, and they will be linked to at runtime instead of being compiled into your binary. If you use a version of iOS that does not include these frameworks, your app will crash because it will be unable to find the library at runtime.
To be more accurate you can compile SpriteKit calls but you can't run SpriteKit calls.