I'll be curious to see how the passthrough looks on the Pico. As far as I know, the Pico isnt going to have a color stereoscopic view, no depth, it'll be a flat color view.
The Quest Pro is supposed to be overlaying their color data over the black and white cameras, so hopefully a feature like this is added to at least the Pico 4 Pro, if not the standard Pico 4.