A technological innovation that flew on a Mach 3 airplane in the 1960s is being reconsidered by NASA, with the hope that modern materials and actuators will make it practical and efficient to fold wings in flight. The Spanwise Adaptive Wing concept to be tested first on a flying scale model in 2017 (if all goes to plan) extends the concept of wing morphing to a new level (or not so new, as it turns out).
Source: aopaNASA revisits folding wings