Turquoise could very well be the new resource. You may not think it is particularly linked to any civilization, but there is huge amounts of it in the American South West.
Additionally, turquoise was a significant part of the long distance trade operated by the ancient pueblo peoples and had ritualistic properties that made it a significant part of their religion.
Turquoise is associated with the pueblo more than any other resource i know, and whilst turquoise itself may not be overtly "puebloan" in the way that venetian glass is venetian, i think its one of the best bets we have for a natural resource.
It also fits mighty conveniently with the mention of the pueblo and how the removal of only Pope was mentioned...
Hmmm Interesting.
It's certainly more viable to me than glass. I kind of expect Venice /Italy to be in at this point but I really dont see glass as the resource being added that is linked to a civ. I'll try to give a stepped out reasoning behind that.
1) Civ useable Resources have traditionally been plonked down on the map rather than self manufactured. Those resources may be used to manufacture things in real life but in CIV5 it's all been about the raw resource itself.
2) When manufactured goods were brought in it was done to give extra flavor to CS's. To get Jewelry or Porcelain you needed the right relationship with the appropriate CS. It added a layer to diplomacy that wasn't already there.
3) Glass is a manufactured good. That means straight away a significant change to how civs use and get resources.
4) What effect does glass give? Gold, Happiness, Production a mix of any of the former.
5) Is the manufactured good exclusive? Whilst Glass is related to Venice it is by no means exclusive in the real world.
6) Resources fall into three basic groups Basic, Strategic & Luxury. What would glass fall into? If it's a Luxury how does that effect the game mechanics. If it's a Luxury wouldn't that mean Venice could grow a larger empire which is counter to what actually happened. If it's not then is it just a new gold adding building and if so then why would you call it a resource and not just a building. If it was exclusive and a Luxury then it totally changes the way diplomacy would work in relationship to one civ alone.
7) Depending on what choices were made that one resource would alter the way diplomacy, happiness & trade work at a basic level all for one civ. That's a heck of a lot of Beta testing for minimal gain.
8) Why Glass? There are many manufactured goods -Shouldn't Russia & The US get weapons manufacturing resources, should China get porcelain, Japan & Korea Electronics etc. To be honest if manufactured goods were in for civs then each civ should get at least one option to specialise in for trade purposes.
9) When I look at CIV5 diplomacy & trade structures I dont see them set up for that and at this point of the game I dont see them going down that road.
10) Why bother. Venice and Italy both offer plenty of other design aspects to work with. Venice was a major trade & naval power and with the new trade route system surely if they were in UB, UA & UU options abound in relation to things like Canals, Ships, Trade route creation & length etc. Glass was important to them and I could see a UB relating to it that increased trade yields etc but does it need to be a resource.
When I look at it logically I dont see it as the easy way to go to make Glass a resource. I still believe that any new resource that is linked in peoples minds to a specific Leader will be a traditional raw resource that is found on the map. Bison, Seals, Marsupials, Eucalyptus, Turquoise, Opal, Maple etc. Something that we relate to a certain specific area. There are other resources that should possibly be in but are not as specific to one area Hemp, Tobacco, Gas, Rubber, Coffee, Tea, Cocoa, Honey, Tin, Corn were all major trade commodities at certain points in time. It's far easier to add a traditional resource to the game than it would be to add extra levels of complexity to things by adding Glass. I could be dead wrong but I just see it as overcomplicated from a design point of view.