>>300827673
Eye tracking means you can do actual foveated rendering, which would be good for wireless VR since you're sending less data to the headset. Varifocal should actually help too since stuff that's put of focus doesn't need as much detail either.
We already know from the latest Half Dome prototypes that Oculus was working on it, so I don't see why they wouldn't put both in their next gen PC headset as long as it isn't super expensive.