The one unit per tile rule has been confirmed. I like the idea in general because I'm certain it will lead to more strategic battles as SODs are now gone for good. I'm wondering though how this rule will affect your interactions with foreign units during peacetime. In Civ IV you were able to occupy the same territory as a foreign unit during peacetime, no problem. Will it still be possible to do this in Civ V? I can see a lot of problems, and opportunities depending on which way this rule goes. If you are forbidden from occupying the same tile as a foreign unit it would be possible to seal off an area of the map by blocking an important pass. In Civ IV I would sometimes build a city to block important passes, even if it was a bit of a stretch to build there, being able to do this with a unit instead would be much easier. However I could also see this becoming very overpowered in a map with many mountains, and many chokepoints. Not being able to move through foreign units during peacetime would also cause problems when moving through enemy territory. It would be possible for their military to get in your way, and if you and the AI entered a chokepoint headed in opposite directions a traffic jam might result. I'm not sure which way I should hope the rule works. I can see some good strategic possibilities if I can block AI movement when we're at peace, but I can also see a lot of headaches if they can do the same to me. For now I'm going to assume that units will be able to move through each other in some way, even if they can't occupy the same tile at the end of a turn. I'll be interested to see how this works.