Are the roads, farms, and mines gonna be able to be upgraded?

I posted this over in the Internal debates made external dev journal, but it's particularly relevant to this topic so I'm going to repost it:

I would love to see different types of roads with increasing bonuses. I kind of assumed they would be in, though. However, even more than wanting different types of roads I want constructing them to be expensive enough that you don't make all your roads to the best of your nation's abilities. Best quality roads should be mostly limited to connecting particularly important points of interest, or going along important trade routes; and lesser quality roads used for less important places.

I see this the same way I see military. Just because I can train and equip powerful knights doesn't mean lesser troops shouldn't be useful; just because I can construct paved roads doesn't mean dirt/cobblestone roads should become obsolete. Road construction was and remains an extremely expensive undertaking, and so creating great highways should feel like one.

I actually see those as two very different classes of infrastructure. Roads are empire-wide, farms are city 'structure'. Farms (and the majority of structures in the game) are production-related, and in general could either be improved through tech (like in most games) or automatically as cities improve or grow. Roads can have significant strategic ramifications - they dictate the fasted routes between locations, either for trade or for war, and the way your empire's road system is designed could have a profound effect on trade, war, resource distribution... Improved roads are a much more involved thing than, say, improving your farms to make +2 food per turn.

It would also go a long ways in making the world feel more alive.