We know that Ford is hard at work on diesel option for the 2017 F-150, along with Hybrid model that is due out in 2020. Now there is a possible third powertrain that Ford is working on.
Automobile and AutoGuide got their hands on new spy shots showing off an F-150 mule with the front fenders and hood covered. On the passenger side fender, there appears to be a door for a possible charging port (the video below gives a better view of it). The spy photographer also noted the engine would turn off at various points and the humming noise of an electric motor taking its place.
Automobile speculates that along with the electric motor, there is likely the 2.7L EcoBoost V6 and ten-speed automatic transmission.
Source: Automobile, AutoGuide