Looking forward to eye tracking. Could be a big step in convenience and interaction. Hope it delivers here.
It can do wonders for interaction as well, however the most important feature is foveated rendering. The higher the max resolution of the headset the bigger the savings become from foveated rendering. An 8K90 VR headset could cost lest resources than a 4K60 game on a screen if eye tracking and foveated rendering work well.
I'm glad to see high speed eye tracking being offered in 2019, gives me hope for it to be included in psvr 2 when it comes out.