What do you hope for the next DLC?

I think this is what is most likely. HRE has had the most requests for additional UU, black riders are present in AoE 3 and have had several fan requests.

It looks to me like they are taking feedback from the fanbase and are incorporating it into content updates.

They mentioned in the press release that they were working on several new units and buildings for existing factions. Hopefully this is the first we see of much more additional content.

I also think it’s worth mentioning that the Crusader civ may not be a variant per-se, more of a combination of multiple civs into a new faction. Variants were new at the time, and they state very clearly that they want to rethink the concept of what a variant is.