The ThingWorx Studio Product page just mentions that there is now support for ARKit for devices with the A9 and higher chip, is there more information somewhere about how to develop experiences in ThingWorx Studio using ARKit?
Check out the ThingWorx Studio help section Create and Publish a Spatial Tracking Experience for some additional information.
I am also getting "Sorry! 3D elements can't be displayed because either spatial tracking isn't supported on this device, or ThingView renderer has not been enabled in Settings". message under Android 6.0. which is supporting under ThinkView.