Everything points out to a UHDBR player (beside it not being in the dev kit, which means little), on top of 4K streaming support, and 4K upscale for games.You cant market a product as 4K when it's not, at least here.
I think people need to drop the PS4K it's a name given to it by people making shit up.
If a PS4 can barely do 1080p at 30fps how is a console equal to 2 X PS4 going to push 4 X the resolution at 30fps??
So yes, it will most probably be marketed as a 4K product, and as long as no game tries to pretend it is 4K native while it's not, it'll be fine.
Here it's about marketing toward what the product is intended to be connected to/ ecosystem it's supposed to live in.
Again, no confusion here, but I'm sorry if the whole 4K market placement is distressing to you... confusing maybe?