rickair7777

Dunno. Lot's of good ideas, but the devil is in the details as far as practicality and economics... that's what they have to refine. Also some things work great to accomplish one goal, but that compromises another objective (ex open rotors, efficiency vs. noise). There's a chinese menu of new tech, some of which is mutually exclusive.

I would expect to see some enhanced laminar flow, possibly engine ingested, higher-aspect wings (braced, or active load mitigated).

Hybrid power systems will likely play a role. Airliners (much larger than a 1900) will not be battery powered, but a hybrid system which provides a battery to boost T/O, Climb and OEI performance would allow the engines to be optimized for cruise flight... ie smaller. Significant potential fuel savings there. The technical challenge is building a hybrid system where the extra weight of the components doesn't nullify the benefit. Obvious way ahead there is a higher voltage... much higher. Obvious technical challenges to that last...

Could also just use a (big) APU to provide the electrical boost for high-thrust phases of flight.

Turbine engines themselves will not see any revolutionary improvements... we've already grabbed the low hanging fruit there, other than possibly even bigger/open rotors. You can integrate hybrid motor/generators into the turbine core to implement hybrid power but that will not fundamentally change core efficiency, other than allowing it to be smaller. Cores will get incrementally more efficient, but there's only so much room left there.

Also new tech will have to be considered in light of ground operations. A flying wing, or hybrid wing/body, will not fit on current gates for example. Easier to fold the tip extension of a high-aspect ratio wing (a la 777X).