Vulcan, over at the Razer/OSVR site, you can sign up to be notified when the HDK2 kit becomes available -
http://www.osvr.org/buy/ , they have a "notify me" tab there someplace. I'm going to grab one too, for the $, it looks great. Having Leap Motion combined with inexpensive VR units will be popular I'm sure, that video is great.
VR will be a large part of the future of PC sims. HT has said how well the controllers with the Vive work in VR for AH. There are piles of aftermarket VR controllers in the pipeline for open source VR units and the Rift/Vive as well. Consider if Saitek/Thrustmaster/VKB/etc start making a VR flight sim controller - ie an F16/15/A10 shaped stick like the Warthog handle which is a VR controller instead which can be held in the hand without a base, and a throttle too (not sure how rudder could work, but I'm sure that could be solved easily enough). Many ideas like this and others out there - so much potential for a more immersive experience in simulation/flying/combat games with these VR headsets.
A lot of potential AH3 future customers ARE going to have VR units, and as the availability of more and more different VR controllers come out, the proliferation of the combined VR technology from headsets to controllers to things we haven't though of yet, will just mean more potential AH customers that will already have the necessary components to jump in and fly/tank/etc in the game, without needing to buy another 400$ set of HOTAS controls. I'm not saying the HOTAS will die off, just that there will be another option that will work well, and that many future potential players will own that stuff for other games they play already, which is a + in the column in terms of making AH attractive to new players IMO.