Going off of the hint from the Community Update No.6, as guessed by LuckyGunner, the Sovetsky Soyuz-class, Iowa-class, Bismarck-class, Vanguard-class, and Yamato-class are likely to be added. I’m not the most educated when it comes to WWII naval (not really more than watching a lot of Drachinifel), but there seems to be a large gap in capabilities between the Iowa, Vanguard, and Bismarck in comparison to the Sovetsky Soyuz and Yamato.
Shouldn’t unfinished or unlaid classes like the Montana-class, H-class, or modernized versions of British WWII battleships be coming with the Sovetsky Soyuz and Yamato?