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Investment caps in cities have been raised, which means that it should now be possible to build all ships and fully upgrade ships. The level cap has been increased, which means it should now be possible to use all ships. China and Taiwan have been added to the game, so I'm assuming that the quests we get are those corresponding to the Ilha Formosa and Land of the Dragons patches to the Japanese version.
In the Japanese version of the game, China, Taiwan, Japan, and Korea each have one dungeon associated. I'm guessing we get the China and Taiwan dungeons now. In the past, Netmarble has shown willingness to pull dungeons out and release them in a different patch--whether earlier or later than the Japanese version got them.
Nanban trade is supposedly enormously profitable--and also very volatile. I suppose we'll find out once we do the imperial quests to unlock the region.
We're also supposed to get a fifth aide now. Presumably that comes when you do the imperial quest. The imperial quests for east asia start in Manila, but require you to have done the previous imperial quests to get access.