'Kislev is a natural fit for the campaign map geography, as they are one of the bastion races against which the tides of Chaos crash,' Roxburgh explains. With Creative Assembly's desire to include pretty much all of the Old World era of the tabletop game, I wouldn't count anything out.
Given Cathay's history with the neighbouring ogre tribes, I wouldn't be surprised to see a proper Ogre faction making an appearance. While Creative Assembly isn't ready to talk about additional factions, Roxburgh confirmed that we can expect more paid and free DLC, which hopefully means more armies to fight with. There also might be good news for fans of ogres.
He adds that they're a good narrative fit, as well, balancing out the 'sheer weight of Chaos you're going to experience.' Historically, Cathay's had to deal with Chaos incursions from the neighbouring steppes, and managed to halt a daemonic invasion. 'Their design team led the way in defining what Cathay would look like as a fully-fledged faction, and we've fed that design through the Total War lens, so in the final game you'll see a playable race as complete and as storied as any other.' 'We've built this incredibly close working relationship with Games Workshop over the years, and Cathay's realisation in Warhammer 3 is testament to that,' says Roxburgh.