does that mean you don't know...? or you do know?
obviously the back would need to be cut open, the iphone4s camera is much larger than what is there. solder? sure, i can do that. but would it work?
firmware is a reasonable concern. I would like to hope that all of that is just in iOS, and maybe (maybe!!) it would just recognize the hardware. maybe a jailbreak would be needed...
it would be fun to play with, if it is possible. the camera in the current ipod touch is awful.