Can't seem to get TrackIR to work at all in the current experimental build. Clicking "Use XInput" under "Controls" does nothing with the mouse, and ticking it with my keyboard doesn't keep the option ticked if I click "apply" and return to the menu, it returns to be being unticked. The second light is showing up to show it recognises the game, and I have tried it in both the 32-bit and 64-bit client, but nothing seems to work with headtracking in the game itself.
Someone else on Reddit has mentioned it also isn't working for them, so posting it here just in case it's a bug and not just a local issue for the two of us.