These 2 Normandy loading screens have been around for quite a long time, yet they both have foreshadowed the current Level 36 tank unlocks for Normandy. It is reasonable to believe that other loading screens could potentially foreshadow future content.
Aren’t those just regular Shermans?
One of them isn’t a normal Sherman because the box on the side of the tank hull is missing.
Looking at the image that was circled again it’s a jumbo because of barrel length and the shape of the back of the turret.
No, it is not. It is clearly an M4A1, because you can see it has a cast hull, while the Jumbo has a welded hull. If you tried a Google search for the M4A1 with the 76mm gun, you can see that the circled Sherman is indeed the M4A1 in game. Here is an example of an irl version of the tank.