The Warhammer franchise is one of the biggest we can think of. Spanning decades across multiple forms of media, even Creative Assembly seem surprised by the success of Total War: Warhammer. And because of the breakout hit, the company has 're-evaluated' the scope of the planned trilogy.
So thanks to your spending habits, the company's Warhammer team is now the largest of the lot. Though they're usually working on multiple Total War games at any one time, like Total War: Arena, the vast majority of the workforce is pouring in the hours required to push out additional DLC for the current Warhammer entry.
It's no secret they're interested in bring all 15 of the current Warhammer tabletop factions to their strategy title, but how long that might take to happen is beyond anyone's guess right now. With the latest DLC bringing that count up to 8, they have two more games in the trilogy to bump that up to the target amount. But from there, they're very interested in bringing in more of the franchise's minor groups if they're able to properly flesh out the lore.
The current agreement between Creative Assembly and Games Workshop allows them to front their questions to the original IP creator when things feel a little vague, so it's likely further games will take players in the direction of whichever factions the group is looking to next implement.
Total War: Warhammer only launched in May, but there's already many heated discussions about where the games could head next.