I'm not sure this is exactly under the radar but I'm excited about wearable AR. No it doesn't look real but once you get past that we have some amazing tech on the horizon.

Microsoft and Oculus have hands free controls that actually work. Inside out tracking is progressing quickly. New UX patterns are getting forged.

I'm exited to see what we'll have in a few years time. In my mind its far more exciting than something like crypto but gets much less press.