While looking through the various Codex I have unlocked yesterday, I noticed this one. It was under the category of The World and was one of the few Codex that was narrated. You can look over every Codex yourself by going under Soldier in the main menu by the way.
I think this bodes well for the possibility of DICE including conflicts in Asian in a future expansion after France and Russia, where Japan is faced off against Germany in the Pacific on four maps. This can be a good addition for a variety of reasons in my opinion, as it can expand more on the idea of colonialism during the First World War, add in more diverse environments for maps being jungles as well as islands, and be a good precursor to a “Battlefield” game about the Second World War. This would also align with the themed expansions introducing a new nation each time, with France and Russia coming before it. Moreover, the inclusion of conflicts in the Pacific would not be a tremendous task in terms of adding in new factions, since Germany already exists in the current game and every new map could just be of them facing off against Japan. Lastly, I just want to say that as someone who is Chinese, I particularly wish for a map focused around the Siege of Tsingtao.