Look at this screenshot , as you see the ones in the photo have no armour , while the ones in game have full plate .... may be this is anothe rsort of mistake or instead we are infront of the so called upgraded units visible on field ? Is possible that this is the upgraded armour version of the pikemen we see in the picture? I really hope so :)

https://img66.imageshack.us/img66/9574/1bp3.jpg