What we want and what will happen are almost always 2 different things.
However, I have a guess. If they call it “campaign-focused expansion”, then they are only planning to add campaigns, not civilizations. What civilizations do we have without campaigns? That’s right - China, Japan, Korea. They also said about February 23rd as the New Year, and this day falls on one of the days of the CHINESE New Year.
We literally have no other options here because the other civilizations without campaigns are the Vikings, Slavs, Maya. They can’t fit into one DLC and would be a very strange choice. Therefore, I am absolutely sure that we are talking about China, Japan and Korea. It is high time. Also if devs are focused on campaigns only, they could make a little longer, like 6-7 missions. East deserves that.
I also want to say that I don’t believe in the Turks’ campaign until a separate DLC about Islamic peoples is released. For now Turks have 2 historical battles and 1 mission in Dracula campaign.
As for the Romans - their card has been played too many times, as many as 4 of their campaigns have to be transferred to RoR, and in the campaign of Alaric and Attila everything that could be said about late Rome has already been said. I don’t believe that a campaign will be released for a race from RoR somewhere outside of RoR. I’m not against yet another Roman campaign, but it would be too confusing a scheme.