Because Dunkerque is being added to the game – though not yet for purchase – with patch 5.9, a few French captains are being added; and if you remember those weird Chinese dragon ships from before, they’ve got captains too, now! It seems like the dragon stuff most likely will be some kind of Chinese-server ARP replacement.
There are also a few new flags, too! Thanks to IsamuKondera on reddit for gathering these up. The preview images for the German battleships are also visible below, but I’ve not included them because they’re on the German Battleships announcement wallpaper.
And the flags: