Well If they cost maintenance, then they might be free to build.
And that would be a good thing that could happen if you don't have gold... your roads disappear. (standard solution to running out of gold..lose things that cost gold)
The "Gold" "Science" separation is Very good
And it basically sounds like sliders are totally abolished (long term planning v pulling a slider up or down)
"This encourages players to long-term planning of empires, and bad practice to pull up and down sliders distribution of money each turn optimizing costs,"
Also (Google Translate)
-Air units (and missile units) are Not limited to 1 upt
"Air units, for example, exist in a separate layer, layers with its fleet with the land army and civilian units. In contrast to terrestrial and marine units, missiles and aircraft can be grouped in a single hexa, enabling use of such major fighting units like aircraft carriers and submarine missile cruiser"
Diplomacy.
"For example, Gandhi will try to act in its peace-loving style. But he will not fail to exploit the situation and start a war, if the player himself would ask for it. In Civilization V, we hope to motivate AI more logical and understandable."
"Relationship with the potential enemy - is the most important criterion, but even if passions inflamed to the utmost, AI will not attack unless it has ascertained that the enemy is easy prey. These include countries with poorly protected area (according to the reports of AI-Intelligence), players with a weak army (for example, because of the technological gap). Last but not least is a comfortable, no natural geographical barriers towards uke city."
Roads Will give movement bonses and 'trade routes'
"They are, as before, accelerate the movement of units on the territory, plus when you connect the two cities you will receive substantial financial bonus. But there is a downside - every move you pay for all of its road, and if you have an unused line, you just throw your money away. We think this will encourage players to make a meaningful way to build infrastructure."