Yes, the AF points are black on the 1D X just like the 5DIII, and unlike previous 1-series bodies, the red illumination of the AF points during focusing is rather weak, and not active at all when using AI Servo (except for the initial point selection).

I haven't checked, but I'm pretty sure you can set the image playback to show the selected AF point. A feature I like even better on the 1D X (and I'm almost certain the 5DIII can do it also) is the Set button can be configured to a one-press automatic zoom to 100% view at the selected AF point, so you can instantly check focus accuracy where you focused (assuming no recompose, of course).