The green vehicle is longer then the ifv in the rear it's also very tall. The gun system has a shroud that does sudgest a attention to Reduced radar signature but it's just to small for a MBT gun. A number of European nations including France the UK and Russia have been investigating higher caliber IFV guns from 35mm to 57mm it could be the Plan is following that trend. The turret size is large enough that I thought it was a SPH but the more I see the more that falls away. The location of the turret should rule out a manned turret. It maybe that the turret has some secondary armament like a atgm system.
At the airshow last year a 40mm turret with telescoped ammunition was shown, albeit on a different vehicle.
This tracked IFV may be using that 40mm gun.