So are Apple going to update the iPad Pro with Mini-LED and a new camera system in March? OR are they going to fragment the line up and add another "premium" iPad Pro later in the year.
If these folks just got the contract, then it is highly unlikely there are any mini-LED panels available this Spring. Fall would be about as early as likely would got to some volume production.
One path would be that the folks with the March rumor are 'confused' as to whether it is a actually an iPad Pro talking about. An iPad Air updated to new camera subsystem and A13 would look like of "Pro" model if judged by iPhone "Pro" adjective assignment criteria. ( Fancier camera than mainstream is a big "Pro" marker.)
Could also perhaps see Apple slapping the 11" form factor onto the Air. ( being brave and dropping the headphone jack there too). That would all the more likely cause assignment of "Pro" to that update.
IMHO, there is a good likelihood of there being an A13X available in March. An A14X would more likely come in Fall. That also couples to there not being a real Pro release this Spring. ( The A14X would come with a process shrink which would all Apple to transistor budget without making the die incrementally bigger. A__X are always a big on the bigger size. an A13X would just be plainly bigger than the A12X )
I hope they just update the iPad Pro in March with Mini-LED, a new processor and the new camera system. They don't need to add another version of the iPad Pro later in the year.
If it is just an Air update then there is plenty of room to update the iPad Pro in the Fall. An Air update with just the camera and plain A13 isn't going to particularly impinge upon the iPad Pro space in the mean time. Less RAM , less GPU raw grunt , less screen tech , etc. will leave enough of a gap for the current Pro models to coast into Fall with relatively few problems.
Apple's AR needs to get into the hands of more folks to make adoption pretty widespread. If confined to the $799 and up zone that isn't really going to contribute well adoption rate. If the mini-LED screen brings another gap building bump to iPad Pro prices ( base starts at $899 ) then even more so. Additionally, Apple's AR is just as likely to have consumer solution space instances as much as "Pro" ones. It doesn't do AR much good to put it on almost single group track development.
It won't be surprising at all if Apple slaps 'XDR' (or some other beyond HDR ) label on the iPad Pro. They won't need the enhanced camera subsystem to justify slapping "Pro" on the models at all. So wouldn't have to confine it just to the iPad Pro for next couple of years. More CPU-GPU , RAM , and way better screen is enough of a gap.
The "thinner" screen could go to more battery volume. Not sure mini-LEDs, if crank the numbers much higher, are going to lead to better power consumption dynamics. And if pushing higher peak brightness even less so.
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I think I read that mini-LED is as good as OLED in terms of blackness and contrast ratio?
That is more so "closer to" OLED than "better than". micro-LED may have a better luck at being "better than" , but those are substantially different and not coming in volume at these screen sizes in 2020.
Although having just read what mini-LED means I'm a bit dubious. Sounds like it rather depends how small they are.
Smaller/Smallest LED drifts into the micro-LED territory. When the LED gets down to about the same size as a pixel then in the micro-LED territory. At that point there is little leverage that OLED has since it too is down at the pixel size level range. If both have a pixel turned off then not particularly going to be any "blacker" as there is no light coming out at all.