I think it’s likely we will get something, but as far as I’m aware the devs haven’t confirmed exactly what.
I am not expecting that we get a tool which works like a laser rangefinder to magically tell you the range to a tank. It’ll probably work something like the PSO-1 sight which gives you a scale to help guess how far away something is. I think with the current sight you’re supposed to use the horizontal bars to estimate range but in my experience it doesn’t line up.
Binoculars for the tank commander are a much needed element right now because there’s no way to look at something far away without using the gun sight. Those binoculars will probably include some kind of rangefinding scale on them.
In the future we’re supposed to also get coaxial and commander machineguns. Coaxials have in the past been used for rudimentary rangefinding as well, so that’s another option.
Something that has been confirmed is that we’re going to be getting different gunsights for different tanks. Notably this included the sight used by the Germans which is interesting for a couple reasons. One, it includes a built in rangefinder. Two, unlike most other sights where the gunner compensates for drop by aiming high, you instead move the crosshair to adjust for range.
When any of this stuff gets implemented is anyone’s guess.