1. First, I could take even 1500€/$ price, if there was some sort of store for hw in my country, it isn't right now.
If device is to be supported for at least 3 years, even such price is right. Rather pricy great device, than cheap garbage.
2. If it won't be device like AR glasses(probably won't), I wish it is able to use AR a lot, be it work or fun. It definitely got great potential as social feature, well fast network would be needed.
3. Off grid AI to ensure safe running of apps is a must, probably not so needed for phone like device, but definitely important part of glasses, as you wont be able to walk or ride without being sure nothing will block your vision.
4. Next important thing is for it to have pen and detection of it when trying to write memo/note on off-screen,...
5. Triple cameras for each color(R,G,B) for big resolution and great low light, also depth sensing,..
6. Always on AI
7. gears like watch, band, 360 camera, AR mount on head for that device, smart shirts,pants,scales,everything..
8. 3D vector screen
9. Great battery whats important for a lot of computing power
10. Being able to be charged or to charge connected devices over few meters
11. Home devices(black,white tech), car, bicycle, skateboard and being able to control them
12. Being able to control everything using Cortana - from devices to payments and suggestions using AR.
I will just stop here, there is just no end to this imaginary surface.