The new unit in the cinematic trailer are Paladins from the Ruination Chamber. They have the Paladin Conclave symbol (the crescent moon) just like Annihilators.
Retributors, Decimators, and Protectors were sold in a box titled "Paladins" which was a bit misleading but appropriate at the time since they were the only Paladin Conclave units, but now there are others.
It's interesting how similar the new unit is to Bastian. Cloak draped over one shoulder, large animal-themed shoulderpad, the raised collar, the sigmar emblem on their right shoulder... Seems like a lot of the same design language.