Rumors from inside Apple state that 12.9-inch iPad Pro will have a Mini-LED screen, but it will be only first generation.

Mini-LEDs are tiny led backlight chips driven by special controller.

For Apple and lot of other manufacturers they represent big dream - it allows to make many generations of screens out of nothing and without any major investments. They also make it easy to design backlight such way so it will 100% break at predictable time (similar to many modern TVs). All they need is to make bad cooling and for small chips it is especially efficient.

Developers from inside tell that Apple already planned 3 generations of screens. Difference will be in constantly increasing number of leds and 1 second peak brightness value. As they can't improve anything else in LCD screen. For tablets and notebooks improving gamut to Rec 2020, for example, has staggering effect on battery life and also introduce big perception difference by different people.

ARM based notebooks also with time will 100% get Mini-led screens. And they also will be improved each year using same strategy. Panel life will be also much shorter than any current LCD panels and can be as short as 3 years total.