There haven’t been any pictures released for the new weapons in the “They Shall Not Pass” DLC. I have however noticed that in order to get more guns into the game they have used both service and prototype weapons from the real world. Using this assumption I have dug up some pictures of the weapons in real life so that we can get some idea of what they will look like in the game.
Ribeyrollers 1918: French attempt at an autmatic rifle.
RSC 1917: gas operated semi-automatic French rifle in service for 9 years
Lebel Model 1886: French bolt-action in service for 53 years.
Chauchat: French LMG 37 years of service
Sjogren Inertial: semi-automatic shotgun of Swedish origin ~5,000 were made.
MLE 1903: Known as the FN model 1903 or Browning No.2 was designed by American company Browning and built by the Belgin company FN.
And that rounds out the guns. Time will tell how true to reality Battlefield 1 will be.