Tablet and touch screen interfaces is a biggie, though the burden of the inertia of decades of desktop computer use has limited innovation on touch based systems.
Wearables and IoT are emerging fields where HCI is getting at least minimal attention, both with similar constraints and potentialities.
When something new comes out most people get excited about the physical thing. I want to get excited about the new paradigm. The new way of thinking about using a thing in society. I'm usually let down.
Come on guys, reimagine.