Most of the nausea issues in VR stem from the disconnect between moving in virtual space without moving in the real world, and Apple seems to be focusing on applications which maintain a 1:1 mapping between real and virtual movement. Games are where that's most likely to be an issue and they're very much not focusing on actual VR gaming, only playing non-VR games in VR on a virtual screen.

The poor UX of moving the user camera in the virtual scene is trivially avoided.

If any of the immersive apps drop framerate, you'll feel it. Its not just a games concern.

I’d like to see how they stand up for longer than a 30 minute demo. For me, the headache doesn’t kick in until about 90 minutes in.