Any soon to be released foldable tablet is not the final form. Graphene flexible screens when they can affordably be manufactured is (a decade off AT LEAST).
As such any product will have creases, and be basically similar to a smart phone. Or in other words - it will not sell that well, only for a niche. Productivity most likely will be the only segment until the crease is removed, and the graphene tech makes it such that it's a consumer product that replaces entirely the slab (along with AR glasses).
The other issues is the OS - android is not at all a good OS for tablets. iOS is, windows is, but android has too much basis in the smartphone market to work optimally on a bigger screen where more feature rich software, detailed UI, and complex workflows come into play.
Samsung however, co-own the graphene OLED screen they developed with Microsoft. So they absolutely want to get into this space. However they have also said they don't like their reliance on android. So I am not sure where they will fall. They might try an android version, and a windows version, and see which one performs better.
Ultimately whomever wins, in the long term will require a hybrid OS. I think of the three, only really apple and Microsoft have a shot at this, and MSFT is marginally ahead because apples secret hybrid OS, and HoloLens competitor are both not released. Still in my mind, apple is in the game, android is not. So it's most probable, that long term, Samsung will default to using windows in their foldable.
There is a reason after all why android tablets are the fastest shrinking share of the tablet market - the apps are designed for smaller screens, and more momentary useage. iOS is vastly more evolved for bigger screens. They still lack a lot of true power software, and that's an issue for the initial market for these devices. Apple will have to release it's OSX iOS hybrid, and start developers down that road, before it's folding tablet will be much more than a portable ipad - which makes it of limited use to enterprise.
But you really have to keep in mind, this is a play for the future. It's not a game changer, not yet. Those creaseless graphene designs you see in that article? Not coming out soon. No way, impossible. Graphene is just far too costly. The screen itself will have to be static for awhile.
And remember - graphene prototypes have been around, on display, in the public eye from numerous companies since 2015 ish. So in this way, that article is EXTREMELY misleading.
The idea is, to attract the developers, and develop the OS, so that it is the most mature and feature rich/adapted the time that graphene OLED becomes at least economically viable for enterprise (and later when it becomes truely folding, without a crease and affordable for the masses, and there ceases to be any value in NOT having it)
There is no way in hell, that time is 2019. Sorry, but thats BS.