Hi Matt,
Regarding getting from the Tobii Website to the EyeX website: there is actually a direct link to the Developer Zone at the top of the page, but I don’t know how many will actually find it. There are a couple of links to the main Eye Experience pages.
Regarding improvements of the EyeX Controller: I believe the hardware will not be changed, but improvements will and can be made in the software. The distances between the illuminators and the camera are carefully selected to get the best possible kind of light reflections on the eyes for our eye tracking algorithms. There is no simple correlation of having better tracking the further apart they are placed, it is a matter of advanced optronics considering lenses, sensors, angles and more.
Regarding head tracking: Yes, as you point out, there are limitations in using only two points for head tracking. I think we will start by evaluating what kind of interactions we can achieve using only the two eye positions and take it from there. But it is of course worth considering alternatives.