The LG 5K3K may not a good price baseline. If thinking it is only incrementally more pixels to "print", then that is probably off. The "micro LED" thing suggests that the 'backlighting' is different here and shooting for a higher HDR classification rating. (perhaps something
like this 1000 local dimming zone monitor that will come later in the year ) That would an additional cost over the additional pixels cost.
The other issue is that unless this panel is coupled to some iMac variant to drive volume and economies of scale.
If there is no increase in HDR (and color gamut) and very high overlap with infrastructure for 5k monitors manufature that continue to run in volume then that $1,500 mark. But if Apple is trying to make a "grand" statement then could slide into a couple grand in price.
Sure, anything's possible. Especially with modern Apple pricing strategies, haha.
Only thing against going above $1500 or so, is whether they actually want to sell (m)any or not.
If they go even to $2K, I suspect that'd knock out a lot of buyers – which they may actually want to achieve, if they can't produce enough at volume, want to keep it exclusively (or near exclusively) aimed mostly at Mac Pro buyers, or any other reasoning.
I personally think for 2019, it'd be a hard sell in the current marketplace, unless it offered really great additional features, like...
1. Two TB3 Macs input.
Pic-in-pic, pic-by-pic, quick flick between full screen Macs.
2. Face ID.
Highly unlikely, given display is remotely separate from hardware.
3. Dock.
10GbE, + whatever bandwidth is left after the display's needs.
4. eGPU support.
Blackmagic Pro is currently only one with two TB3 ports; hopefully the eGPU would work for displays plugged directly into any TB3 Mac.
5. Decent stand/mounting.
Easy VESA mounting. And a stand with all functions: height, tilt, swivel, pivot.
We'll see. But no doubt, with my pessimistic hat on, it'll either be disappointing due to lack of functionality, high price, or likely both.