I honestly don't see a reason why they should. There are already quite good 4k screens out there, and they already developed the 5k screen. Why put money in R&D to build something the competition already has if you already have something more advanced at your hands?
I guess they'll find a way to connect such a display to a Mac. One solution would be to use two Thunderbolt 2 ports. But that'd only work with the Mac Pro, as every other Mac only has one TB controller (please correct me if I'm mistaken, but I believe the two TB ports in some Macs are accessing the same controller).
Also, they could make use of the additional bandwith TB 2 offers, but that would slow down other connected TB devices. Maybe they manage to work with some kind of h.265 compression to transfer the signal, but this would make the screen even more expensive due to the need for an h.265 decoder. But I guess they'll find a solution, it's just unclear whether it will work with current TB2 equipped Macs.