What Apple is up to in the “3D” arena now and will have to offer in the future is “mostly” conjecture and rumors at this point in time, but the possibilities are interesting. Recently, Tim Cook might have tipped what’s up, a bit.
Tim Cook Talks About Apple’s Augmented Reality Ambitions (John Paczkowski, BuzzFeed)

“Maybe” they are up to something. That’s all we know for sure. In the meantime, the good news is that Apple phones work with YouTube 360 videos, Google’s Cardboard and Mattel’s View-Master. Here are some more articles on the subject…
Apple VR Project (Mac Rumors)
Apple building secret team to work on virtual reality: FT (Reuters)
Apple Sets Its Sights on Virtual Reality (Kate Benner and Nick Wingfield, New York Times)
Apple Seriously Ramps Up Hiring In Virtual Reality (Aaron Tilley, Forbes)
Here’s How Apple Intends to Integrate VR into its Ecosystem (Mohid Ahmed, Bidness Etc)