transport copter-helicopter unit---
this would be a slightly weak (15-20 strength) helicopter that could carry 3 gunpowder, melee, recon, and archery units up to six tiles per turn. has a 20% bonus vs melee and is able to fly over coast. would look like a generic twin-rotor helicopter
http://www.warbirdphotos.net/aviapix...rs/CHINOOK.JPG.
armored transport copter-helicopter unit---
a 30 strength transport copter, capable of carrying just one unit of any type 6 tiles per turn. +10% vs armored, +20 vs helicopter, +40 vs armor. would have a slightly smaller twin-rotor copter (see above), flanked by 2 apache gunships (1 on either side).
Satellite Unit---
A new category of unit would be satellite units. when built, you would choose the satellite's path of orbit, and after that the satellite would do the rest. some would have features that you can control. to control satellites, view orbits, etc, you would use the satellite screen (this would be added along with the different advisor screens in the top right of civ4. satellites can be traded with other civs through the diplo screen.
Imagery satellite-satellite unit-these satellites would have cameras.---
these satellites would take pictures of terrain with their cameras, constantly updating your view of the area near their orbit. angle of cameras is adjustable through satellite screen.
close-up imagery satellite-satellite unit-see what's there.---
these satellites would allow you to see units on tiles, not just the tiles. and you can see what units and wonders are in a city, if its a holy city, etc; not just that the city is there. seeing close-up means taking a picture with a high-power zoom lens, so the area that you are seeing is much smaller. angle of cameras is adjustable through satellite screen.
anti-missile satellites:-satellite unit-intercept missiles as they come.---
but would only have a 50% chance of doing so.
anti-ground satellites:-satellite unit-blast the ground from way up!---
would have a 50% chance of hitting the target tile, a 40% chance of hitting one of the 8 surrounding tiles (5% per tile), and a 10% chance of not hitting at all. choose target from satellite screen
anti-satellite satellites:-satellite unit-destroy satellites from satellites.---
50% chance of missile hitting the target satellite. choose target from satellite screen.