The bigger issue, though, is head-tracking -- something 
    Carmack's actively concerned with and working to solve 
    ahead of a retail release. "A lot of the work at Oculus 
    has gone into working out better position tracking," he 
    told us. "The tracking side is something that there hasn't 
    been as much of a push for and we're frantically working 
    on a lot of that, because that is one of the other really 
    large issues. But we expect that the next developer kit 
    will have higher resolution and position tracking 
    addressing some of these significant issues."

I find it incredibly refreshing when a company working on a hard technical problem is candid about the engineering challenges that lie ahead.