I noticed the Dogs of War characters have been requested by many as a playable faction, but there is the trouble they're more of mercenary group rather than an empire building army. Then, remembering playing as Yan Baihu from TW: Three Kingdoms, an idea hit me: mercenary contract work.
The idea would be that the Dogs of War faction would be a horde group (bare with me), that takes out merc contracts from the in-game factions and is rewarded and supported through that system.
For example, the DoW could take a contract from a high elf faction to take out a specific dark elf faction. Once they agreed to it through diplomacy, the DOW get a bar they fill up by attacking dark elf armies and taking out settlements. They can naturally sack and raze enemy settlements and get gold from that like any other faction, but when they're on a contract, they can also give that settlement to their contractor. These actions will fill your bar and your contractor will give you rewards like gold, reduced upkeep, special items, and maybe even special units that the contractor would provide (like artillery, monsters, and special units themed to that faction). The idea is through contract work, your armies are supported through their mercenary work. And to improve upon the idea from TKs, your armies don't all have to be tied to a specific faction. For example, one leader could be set to attack the vampire counts for the empire while another is in Lustria, taking out skaven for the Lizardmen. And for the challenge, you have to maintain your contract bars by winning battles and not letting them expire over time. They eventually will run out through a number of turns and then you can take another one for that army (letting them expire or ending one early without the contractor wanting you to end it if they made peace or so would hurt your diplomatic relations)
Since the DOWs wouldn't be capturing settlements for themselves, their goal could be build up "reputation" or such (like the Vampire coast), and the game would be concluded (Vortex and Mortal empires) when they reach their max reputation. But in the mean time, reaching new levels could grant bonuses like increased gold, faster recruiting time, faster and cheaper horde upgrades, and even stuff like fear bonuses (like your army is so infamous, the enemy army loses leadership faster against you).
So do you guys think this is how we could see the DoW in WH3 or maybe even hopefully a future lord pack?