They already said there will be a big content update in May.
You people are drowsy, haha.
"In the next update, which will deploy during the first week of May, we will add new penances for each class in Darktide. These penances will have targets that will be easily obtainable while encouraging more cohesive team play!
[…] achieving penances will unlock new free cosmetics for each class."
-Fatshark Catfish
Source: Community Comm-Link 13th April