From a developer point of view, sometime, not only money, there're so many criteria for a dev to delay Big screen version, ie:
- Yet completing, yet polishing.
- Market priority (may be they think that the major FieldRunner's Fan are almost about iPhone/iPod)
- Build size ( I saw that the game is already 4x MB), over 50MB makes it impossible to download via 3G, that's a great impact too and a good reason for a developer to release separate HD version or spend more time on optimizing to have the universal one.
So, I guess, we enjoy the iPhone version first and let's see what's next. Hehe