Let me give you a few more Potential Uniques: just a scattering:
1) England
New Unique Units: Billman (Pikeman replacement with Melee Class bonuses); Congreve Rocket (ranged Industrial Era unit, replaces nothing, reduces combat factor of any unit it attacks for the rest o the turn); '74' (74-gun Ship of the Line, the most common type in the Royal Navy - cheaper to build and maintain, Royal Dockyards build 2 for 1 like Scythia's light cav); Battlecruiser (faster Battleship but less combat factor, but Upgrades to an Aircraft Carrier); SAS (Special Air Service) (a Modern Era Special Forces Unit, moves like cavalry, can attack and destroy Great People like Great Generals and has a special attack against Aerodromes or airfields that can destroy or damage aircraft in them)
New Unique Infrastructure: Public House (Pub) (Building for a Neighborhood or City Center District that adds Amenity and Gold);
2) Germany
New Unique Units: Prussian/Hessian Grenadier (Industrial Era Musketman replacement: when garrisoned in a city adds Production); Stosstruppen (Modern Era infantry replacement: ignores enemy ZOCs and can move after attacking)
New Unique Infrastructure: Rathaus (City Center Building); Kurhaus (Industrial Era Building for Neighborhood, City Center, or Entertainment District, but only one to a city: adds Amenity and Gold)
3) America
New Unique Units: Mountain Man (Ranger replacement); Homesteader (Civilian unit that can defend itself, Settler replacement); Mounted Rifles (Cavalry replacement, anti-cav get no bonus against them)
New Infrastructure: Union Station (City Center Building, with Railroad produces extra land Trade Route and Gold);
4) The Netherlands
Unique Units: Dunkirker (Privateer replacement); Coehorn Mortar (Bombard replacement Siege weapon)
Unique Infrastructure: Bourse (earlier Stock Exchange)
8) Sweden
New Unique Units: 'Ga Pa' infantry (pike & shot replacement)
10) Scotland
New Unique Units: Covenanters (Musketman replacement); Royal Scots (Infantry replacement)
New Unique Infrastructure: Distillery (Improvement, must be next to a lake or mountain)
MEDITERRANEAN/LATIN CIVS:
1) France
New Unique Units: Wild Geese (mercenary infantry - pike & shot replacement that Upgrades to Musketmen); Garde Suisse (pikeman replacement); Zouave (fast moving Industrial Era infantry)
3) Byzantium
New Unique Units: Thematic Infantry (spearmen with long swords, both Melee and Anti-Cav)
SLAVIC/CAUCASIAN CIVS:
1) Russia
New Unique Units: Opolchenie (Militia - cheap Musketmen or Infantry); Strafbat (Punitive Unit - chance of automatically formed Infantry whenever another Russian Unit is destroyed or forced back); Sturmovik (replaces nothing - Fighter type air unit with greatly increased attack factor against ground targets)
New Unique Infrastructure: Hermitage (an Improvement, produces Religion, Cultire)
AMERINDIAN CIVS:
5) Great Plains Civs
Common Appearance: Comanche, Cheyenne, Lakota (the first of the Sioux tribes to move onto the plains)
New Unique Units: Cheyenne Dog Soldier (elite Cavalry or Horseman)
New Unique Infrastructure: Sun Dance Lodge