Updated for Gathering Storm!
New Units:
HMCS Haida (Canada)
Canadian unique Atomic Era Naval Melee unit that replaces the Destroyer. +10 Combat Strength versus Naval Raider class units. +5 Combat Strength when in formation. Prevents friendly Traders within 4 tiles from being plundered as long as they are on a water tile.
Kalandozó (Hungary)
Hungarian unique Medieval Era Ranged unit replacing the Crossbowman. Double gold from pillaging Districts and Improvements. Yields 50% of defeated units' Combat Strength as Gold on combat victory.
Chasqui (Inca)
Incan unique Ancient Era Recon unit replacing the Scout. +1 extra movement and can build roads.
Sofa (Mali)
Malian unique Medieval Era Ranged unit replacing the Crossbowman. +5 Combat Strength vs damaged units. Adjacent Cavalry units receive +4 Combat Strength.
Toatupara (Maori)
Maori unique Industrial Era Recon unit replacing the Ranger. Weaker than Ranger but can attack twice per turn. Can build Pa Improvement.
Sipahi (Ottomans)
Ottoman unique Medieval Era Heavy Cavalry unit replacing the Knight. +100% flanking bonus and requires fewer movement points to pillage.
Numidian Cavalry (Phoenicia)
Phoenician unique Classical Era Light Cavalry unit replacing Horseman. Has Ranged Attack. Can move after attacking.
Kronan (Sweden)
Swedish unique Renaissance Era Naval Melee unit replacing the Frigate. Combat +5 adjacent to another Kronan unit.
Templar (Eleanor of Aquitaine, England/France)
Leader unique unit for Eleanor of Aquitaine. +5 Combat Strength Combat Strength when opponent is another religion. +5 Combat Strength within 4 tiles of any Holy Site District.
Also Longbowman is now the default UU for England.