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Took a look at the tech tree on gamespot. Hard to make out a few of the units because of the low screen res of the shots, but it looks like this covers most of the breakdown of new units and techs:
4 default units:
settler
worker
scout
warrior
6 ancient units:
archer
catapult
trireme
horsemen
spearman
swordsman
11 middle age units:
cannon
frigate
galleon
(sailing ship 1)
(sailing ship 2)
land unit-explorer?
arquebuser
knight
pikeman
musket?
15 industrial age units:
paratrooper?
helicopter
marine
fighter (spitfire like plane - the mysterious biplane in an early screenshot seems to have been removed from the game)
bomber
infantry (modern)
infantry (civil war era)
artillery (wwII)
ironclad
battleship
transport
submarine (early-wwI/II era?)
cruiser
destroyer
10 modern age units:
stealth bomber
stealth fighter
modern abrams tank
submarine (nuclear?)
missile (type1)
missile (type2)
missile (type 3)
APC (personnel carrier)
square blob like vehicle
modern fighter jet
16 custom civ units:
aztec eagle warrior
F-15 fighter
panzer
musketeer
MiG
persian elephant
samurai
roman legion
iroquois mounted warrior
impi
man-o-war
hoplite?
babylonian archer
egyptian something or other
indian whatchamacallit
chinese thingamajig
Total: 62 units by quick count.
Not making a reappearance (unless they are a blobbular thing I couldn't identify):
mountain troops
dragoons
cavalry
spies
diplomats (gotta be one of the unidentified units?)
carvans/frieght
crusaders
howitzers/cannon?
Advances:
ancient:
masonry
bronze working
alphabet
pottery
wheel
warrior code
ceremonial burial
mysticism
polytheism
horseback riding
monarchy
mapmaking
literature
code of laws
philosophy
currency
republic
middle ages:
monotheism
theology
printing press
music theory
feudalism
invention
chemistry
banking
gunpowder
astronomy
chivalry
democracy
free artistry
economics
navigation
physics
theory of gravity
magnetism
metallurgy
military tradition (dragoon?)
industrial:
nationalism
communism
espionage
industrialization
refining
steam power
corporation
steel
electricity
medicine
scientific method
refinng
sanitation
combustion
replaceable parts
electronics
radio
motorized transport
flight
advanced flight
amphibious warfare
mass production
modern age:
recycling
ecology
rocketry
spaceflight
fission
computers
miniaturization
nuclear power
genetics
laser
smart weapons
robotics (howitzer blob?)
integrated defense
satellites
superconductor
stealth
synthetic fibres
(i might have listed a few twice and omitted one or two)
Phutnote
4 default units:
settler
worker
scout
warrior
6 ancient units:
archer
catapult
trireme
horsemen
spearman
swordsman
11 middle age units:
cannon
frigate
galleon
(sailing ship 1)
(sailing ship 2)
land unit-explorer?
arquebuser
knight
pikeman
musket?
15 industrial age units:
paratrooper?
helicopter
marine
fighter (spitfire like plane - the mysterious biplane in an early screenshot seems to have been removed from the game)
bomber
infantry (modern)
infantry (civil war era)
artillery (wwII)
ironclad
battleship
transport
submarine (early-wwI/II era?)
cruiser
destroyer
10 modern age units:
stealth bomber
stealth fighter
modern abrams tank
submarine (nuclear?)
missile (type1)
missile (type2)
missile (type 3)
APC (personnel carrier)
square blob like vehicle
modern fighter jet
16 custom civ units:
aztec eagle warrior
F-15 fighter
panzer
musketeer
MiG
persian elephant
samurai
roman legion
iroquois mounted warrior
impi
man-o-war
hoplite?
babylonian archer
egyptian something or other
indian whatchamacallit
chinese thingamajig
Total: 62 units by quick count.
Not making a reappearance (unless they are a blobbular thing I couldn't identify):
mountain troops
dragoons
cavalry
spies
diplomats (gotta be one of the unidentified units?)
carvans/frieght
crusaders
howitzers/cannon?
Advances:
ancient:
masonry
bronze working
alphabet
pottery
wheel
warrior code
ceremonial burial
mysticism
polytheism
horseback riding
monarchy
mapmaking
literature
code of laws
philosophy
currency
republic
middle ages:
monotheism
theology
printing press
music theory
feudalism
invention
chemistry
banking
gunpowder
astronomy
chivalry
democracy
free artistry
economics
navigation
physics
theory of gravity
magnetism
metallurgy
military tradition (dragoon?)
industrial:
nationalism
communism
espionage
industrialization
refining
steam power
corporation
steel
electricity
medicine
scientific method
refinng
sanitation
combustion
replaceable parts
electronics
radio
motorized transport
flight
advanced flight
amphibious warfare
mass production
modern age:
recycling
ecology
rocketry
spaceflight
fission
computers
miniaturization
nuclear power
genetics
laser
smart weapons
robotics (howitzer blob?)
integrated defense
satellites
superconductor
stealth
synthetic fibres
(i might have listed a few twice and omitted one or two)
Phutnote
. I won't be surprised if you get bored of it in a week. 
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