Inuit
Many northern maps are barren and inaccurate and could be improved with new fauna like seals and walruses and a minor faction like the Inuit.
Location: Alaska, Yukon, Arctic Territories, Saguenay (Winter Version)
New maps like Greenland, Keewatin (split from Dakota and NWT), and Ungava (split from Saguenay)
Unique Units: Qamutiik & Kayak
Qamutiik (Dogsled) - Light ranged cavalry that boosts the speed of units in formation with it.
The speed boost to other units would represent the cargo-carrying function of the sled by taking on heavy equipment of nearby units. This would work best as a flat rate boost rather than a percentage since it would have a proportionally greater impact for the slowest units which would benefit formations the most. Stats similar to a dragoon with slightly less speed would be sensible.
Qamutiik could be armed with either a traditional sinew bow or a rifle for ranged combat and melee attacks would be done by the dogs.
Kayak - A boat enabled at the dock with a function somewhere between a fishing boat and canoe.
Same gather rate, garrison capacity, and train time as a fishing boat, and same cost, health, and attack as a canoe. Possibly shift some siege attack to ranged and drop the range slightly. That would make them slightly less effective against ships and buildings, but better against land targets near the shore.
Techs:
Ivory Trade - Ships 6 walruses. 25% of hunted animal yield is collected as coin. This could be limited to large animals only (anything with shrine generation rate of 0.08 or more)
Edit: The gold yield could be limited to hunts under the aura of an Inukshuk to be easier to manage and be compatible with Fur Trading.
Inukshuk - Enables dogsleds to build Inukshuks that function like granaries. Can be built on ice
Ammassalik Wooden Maps - Increase line of sight. +2 for land units and +3 for naval units
Driftwood Construction - A small amount of wood is gathered from fish and whales (in addition to food and coin)
Igloos - Native warrior train limit is increased by 20%