There is some work regarding making transistors out of different materials as a way to eke a bit more out. Similarly, there is a lot of work regarding layering circuitry to an even greater degree. And, of course, there is the usual pie in the sky solutions.
But none seem all that promising and my gut is that we'll focus more on interconnects and algorithmic improvements.
Computing using coupled magnetic spin. Or photonics. Or nanomechanical rod logic. Or nano-electro-mechanical logic. Or ballistic electrons. Or single electrons in nano-structures similar to what a cell uses in the Krebbs cycle.
But none seem all that promising and my gut is that we'll focus more on interconnects and algorithmic improvements.
But time will tell.