The OLED display will likely be the same for the current and 2018 X. Anyway I think Kuo’s observation that the 2017 X will not be sold alongside the newer model is valid. I think there will be a price cut to the new model, so why have the older model price chase below that?
In other words, if the new model is $899 or $949, what do you do with the older model? $799? $849? Now it’s running into that rumored 6.1” FaceID phone in the $700-800 range.
Especially considering there may be very little difference between the old and new X, maybe just A11—>A12 and FaceID 2.
There’s just really doesn’t seem to be any real reason to keep the 2017 X in the lineup, with the 2018 model becoming the cheaper X that Apple (and consumers) want.
Re: inventory turns, the metric would include inventory at Apple stores, but not other retail channels as those are considered sold already. There’s an interesting article that poster
@Synchro3 linked to a little while ago, “Inventory is Evil”
http://cmuscm.blogspot.ch/2014/09/inventory-is-evil-well-done-tim-apple.html
At that time inventory was turning every 5 days, as of the Sept 2017 financials I think it was about 8.