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Regarding the "race" packs, I would argue that "Mongolia" and "Korea" are guaranteed, as they are very easy to implement, map-wise, while Three Kingdoms has sold remarkably well in South Korea. "Vietnam" and "Japan" are also strong candidates, but I am a bit more skeptical, as adding them to the campaign map would not be very easy. However, both cultures would be welcome by the fans, thanks to their exoticism and the fact that Japan is extremely popular on a global scale. Tibet, on the other hand, seems very unlikely, not only because of political reasons (which are a bit exaggerated), but mainly due to its general obscurity.
The parts of Vietnam that were relevant are already on the map, though half of it is just fog of war'd out and has no settlements. The area colloquially known as South Vietnam was not only not involved, it wasn't even Vietnamese at this time. Central Vietnam revolted and declared independence under the Cham early in the timeframe and was subsequently ignored for the majority of the remainder.
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For the expansion, similar to what Fall of the Samurai, Napoleon and Attila were to Shogun, Empire and Rome II respectively, the Warring States seem absolutely certain. After the Romance of Three Kingdoms, the period leading to the first unified Chinese Dynasty is easily the most popular one and, from a warfare perspective, does not demand a radical modification of the game's mechanics. Although it could be announced in 2020, I doubt it will be released before 2021.
The issue with the Warring States is that it would be very hard to implement the Romance mode onto them, due to both the nature of the time period and the lack of well known warrior-generals occupying the same area. Warfare and statecraft was also fairly different within that era. You're dealing with well established states that are in the midst of philosophical and governmental transformation. The era itself is huge, and would probably be a Saga game at the very least, though a tentpole release would be my bet.