This picture was sent by Roman Beránek from Prusa Research.
He is using two displays one LCD and another HDMI with different resolution.
His patch is being reviewing now.
We also are working on this dual display use for some time, but we want to may dynamically switch between LCD and HDMI so TERES-I can work with projectors, we are close to release it in new image.
olimex 
May 28, 2018 @ 15:59:07
Now that sounds great!
What else your new image will contain as improvements?
Though, I suppose you’ll post a new thread about it when it is available, detailling everything.