Like They Shall Not Pass, In the Name of the Tsar will bring some new weapons to the table. DICE hasn't confirmed the list but thanks to the concept images we have a solid read on one of the items coming in the DLC.
Nothing is confirmed confirmed but there's a very good chance the Fedorov Avtomat makes it into the final version of the DLC. The weapon is visible in the DLC's concept images.
If you're unfamiliar with the weapon, the Fedorov Avtomat is a Russian automatic rifle that was produced in the Russian Empire for the war.
In was in service for 25 years before it was discontinued in 1940.