> ...just a measure taken by Apple to cover it's bases in case VR takes off
I don't think Apple engages in that kind of speculative R&D. It's R&D is directly geared into product development (there are probably arguable edge cases). That's why it's R&D budget is so tiny compared to companies like Googe and Microsoft. I can't see them investing much in a huge, complex and poorly defined area like VR unless thay have some pretty specific ideas in mind.