Image quality is already pretty good in my mind, I'm never going to complain about better, but it's a long way from unuseable, it's already very enjoyable I feel. It can already do 120hz. If you can find me a graphics card to drive it at full resolution and 144hz, then sure, why not...
FOV. No arguments from me there, which would then require an increase in pixels to keep the current quality, so the first answer is a sort of yes and no.
Weight doesn't bother me in the slightest. Especially once I've put a counterweight on. So it's definitely not weight, but weight distribution for me. However, I'd rather they keep their current modular design, than place the battery at the back, which likely forces you into using their headstrap solution.
EDIT - However, as stated, the leaks seem to be focused on the eye tracking and face tracking. Which the quest 2 chip is already capable of. I'm guessing this will be an updated quest 2, not a revamped quest 3 with different lenses/fov/screen etc.