Appreciate your enthusiasm, Elliot, but you're mixing things:
elliotttate wrote:
… Pixel Farm was just showing off a 3d-tracker for iPhone and iPad to use while filming with other cameras: PFTrack 2017 - RGBD Depth Sensor Support - YouTube
that's no i-device, they even mention the name:

plus, you got for years free software, to read out z-/depth of any 99$ XBox-camera.
plus, ARkit utilises not only optical sensors …
elliotttate wrote:
…
True, ARKit is built for iOS, but the tech is kind of in OSX already in the XCode 9 beta 2. I'll have to look up the article later, but it said that Apple was committed to creating all the development tools for ARKit and that means updating FCPX and Motion. …
that means, when coding for iOS, for sure the dev.tool XCode has to 'contain' ARkit... Does NOT mean, iOS-kits are available in macOS.
elliotttate wrote:
… They just recently hired Tim Dashwood who specialized in VR plugins for FCPX and Motion and they said they would be bringing native support for 360 vr in a future FCPX. "Also later this year, Final Cut Pro X will add support for professional 360-degree workflows with the ability to import, edit and export 360-degree video."
http://www.fcp.co/final-cut-pro/articles/1973-wwdc-2017-a-new-imac-pro-kaby-lake -processor-updates-and-the-new-high-sierra-macos…
I know this article, I'm Moderator at fcp.co 😉
but the Dashwood tools are for VR, not AR... 360° video needs no depth-info, nor planar tracking, nor 'estimating of light situation' (underrated new feature in ARkit) …
anyhow…
we get off-topic…
the next 2-3 years will show lots of awesome new 'toys', that's for sure.