Well, it will have a fixed screen :-
Product Stories of New APS-C Vol.3?Wakashiro? | PENTAX official
The primary reason given is that it allows the body to be thinner and lighter. A secondary reason, one more of principle, is that Pentax majors on optical viewfinders so the type of screen is of lesser importance. These reasons are fair enough.
But other reasons are given which are more questionable. One is that it allows a larger screen, which contradicts the idea that the screen is of lesser importance. Another is that it allows a projecting eyepiece, but they could have done that anyway, and does that not add to the overall body thickness? Another is that it allows the camera body to be made "sturdy", but there are many ways to make something stronger and reducing the body depth is not the first one that springs to mind.
Moreover, my old Pentax LX also majored on its optical viewfinder because that is all it had, but in its case you could get a waist-level finder, and I did, and I use it. I doubt the K-new will offer one.
I won't be getting a K-new but my concern is that Pentax's future is partly riding on it, and the "influencers" like DPReview, Tony Northrop, Kai W, etc are going to crucify the K-new for not having even a tilt screen. There is going to be a bloodbath. You might not attach much weight to what those guys say, and I don't, but unfortunately many other people out there do listen to them and lap up (and repeat) what they say.