Yeah the wings are flexing upover. That means they are under load. They flex more than most and so they really show how those wings are lifting the central "tube" of the airplane.
The pic is frozen in time whereas in reality the aeroplane is in motion. I was not looking for anything too fancy here....I was seeking to lead Wranga out. Literally educate him how to assess what he sees using everyday physics.
The flex on the wings is remarkable and is I would GUESS due to new materials.
Is it a mass saving exercise? YES! Is it more efficient? see last answer!
pst script: test lab
YouTube - Boeing 777 Wing Load Test