Deep Learning driven NLP. We've seen massive advancements in research, but from personal experience working with a few startups, these new forms of NLP are just beginning to hit the market now (most companies are still using Classical NLP techniques like part of speech tagging etc). It's a huge space and I can't wait to see its use cases expand.

Brain-Computer Interfaces.

Augmented Reality. As someone in this thread mentioned for self-driving cars, I think the hype cycle for AR is in the right spot for us to begin seeing real advancements in the next couple years, especially with Apple's recent announcement.