At one point, the swedish army supposedly experimented with elk-riding cavalry. It failed because the animals are not trainable like horses. I predict that the Swedish faction will have such a unit.
For the Americas: I am guessing ahistorically regimented Indian units. Cannon-armed canoos and field artillery is also likely to make an appearance.
Russians may get access to the Tsar-cannon, historically a huge but impractical artillery piece.
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