I don't really believe Apple's going to make a watch, but if they did, I would expect it (for third party apps) to simply be a UIScreen that would launch the ap

I don't really believe Apple's going to make a watch, but if they did, I would expect it (for third party apps) to simply be a UIScreen that would launch the app on your iPhone if you tapped it. I wouldn't expect much interaction beyond that since Apple killed the watch face size iPod Nano. I wonder if that was an experiment to see how people took to interacting with a screen that size, and that it was ultimately a failure.