"Superjet" turbofan-turbojet hybrid jet engine could power future fighter aircraft

GE Aviation is developing a revolutionary new jet engine that aims to combine the best traits of turbojet and turbofan engines, delivering supersonic speed capability and fuel efficiency in one package.

The new engines are being developed under the USAF ADVENT project, which is seeking 25 percent fuel saving which will in turn lead to an increase in mission capability.

http://www.gizmag.com/ge-aviation-develop-advent-variable-cycle-jet-engine/25556/