unmanned transport
I'm interested in the scaleability of the new Pratt GTF series. So far indications are that it will be scaleable all the way from engines powering the Japanese MRJ 100 seat jet to wide bodies.
I would think the GTF engine would be capable of being scaled larger or smaller than that targeted for the A-320NEO. So far all looks well in the testing phase. Much will depend on the robustness of the gear feature and whether or not required maintenance of this feature is minimal.
Don't forget about the GE "LEAP" engine. It too is going to offer 15% or better fuel utilization verses current engine technology.