True, next year will be the big Must have. IMO why ?
#1. Finger print reader Under Glass a must have period.
I really doubt this'll happen. Ever. FaceID is more secure and has been just as usable as TouchID on my X, sometimes even more so depending on the situation, and is definitely a more seamless experience when it comes to authenticating purchases, loading keychain credentials automatically, etc. Introducing all the massive complexity needed to have TouchID under the glass is simply not necessary, especially for a regression in security and a reduction in seamless experience.
#4. 5G compatible even if all the towers aren’t there it should last a good while
Not sure when this'll happen. Maybe next year, but we'll see.
#5. USB-C but then again this year Model should have it too.
I'd be surprised if this is going to ever be a thing. Apple seems to be moving to a 'no ports' ideal, and there's compelling reasons to do so.
That said, I love my X, I'm sure I'll love the X Plus (or whatever it's going to be called), and even as I'm loving having that X Plus OLED amazingness, I'll be looking forward to 2019's offerings as well.