John Carmack offers some positive insight. Could positional tracking be included after all? It's something he's stated he's been working on since last year and it's pretty much the one thing people don't think is possible in mobile yet.
“We say we’re going to accomplish a whole heck of a lot this year, and others will say there is no way we can. Well, maybe. But I know we’re going to get more done than people think is possible.”
You could interpret those words as an admission to not being human, although I'm pretty sure that's not what he intended, and alien life forms are smart enough to not give themselves away so easily, so he is human after all! Wheww... that is certainly good news 😄