So we know that Volkmar was first introduced in the Grim and the Grave DLC in TWWi, where he was matched with Ghorst the meme. Rich in this interview
stated that the team agreed wasn't great and wasn't "his finest hour" (timestamp around 04:49) and that it was a conservative choice due to being the very first head-to-head DLC.
So we know Volkmar's faction mechanic has likely been changed to conform to his book hunt instead of the Electoral system. He should also rely on Sigmarites, as in, reinforcements somewhat like Huntsmarshal's Expedition's mechanics, but costs zeal, or something. But he should also get the two arch lectors of the Empire: Kaslin and Aglim (not LLs, just unique Lords, maybe unlockable via quests). And hopefully the Arch Lector Lords can get renamed something else as well (or, failing that, restrict it to Volkmar's faction). Also, all the Empire RoRs in that DLC are part of Volkmar's crusade, so I hope to see them be prioritze towards Volkmar's faction. Knights Griffons and Knights of Sigmar's Blood can be interesting Sigmarite RoRs to be added in a later rework.
Anyways, these are just my ideas for a Volkmar rework, someday. Thoughts?