They will. Almost certainly. I would be surprised if next year they (finally) retire the 8 and the next gen X and X+ are launched. Everything we know about the development of this iPhone seems to indicate that will happen.Phone is definitely smaller, and you can see that on apps that's not been updated yet for this screen. I'm just hoping Apple will make a XL or X Plus size next year.
Other than that, the new features and gestures on this phone is very easy to learn. Apple was right again, it was seamless!