1. When playing on on of the available collapsing capital hexes do you still have to pay the original cost for that hex (i.e. 1 water) if there was one. Or do you just treat the new hex overlay as the new hex action and disregard the original hex cost.
Since the original hexes will be covered and the new tiles are a stronger version of the Capital Actions I would say you don't have to pay the original cost. (It doesn't make much sense to me)
2. In the nomad exchange there is a symbol of a 3 colored cubs with a 2. Does this mean 2 resources of any kind (1 uranium and 1 gold) or must it be 2 of the same type only ( 2 titanium)?
According to the rulebook:
Exchange any two of Titanium, Uranium, or Gold to 3 Water; or vica versaIn my interpretation you can mix two kinds of resources but I hope we will get a confirmation or correction in this question.