Its only going to work with games that are on the Mac - integration with iOS is only going to occur with mutiplatform titles that the developer specifies as compatible. Think of a game like Angry Birds - their are distinct iOS versions for the iPad, iPhone, and the Mac.
You are not going to be running the iOS version on the Mac - Craig made it clear with the demo that the developer made a Mac version simultaneously with the iOS version. They will be dedicated apps.