While we're at this, could you explain the bonuses we saw in the video? The bonuses for Cocoa, Diamonds, and Ivory, how would they fit in historical context?
@Alexander's Hetaroi already gave a pretty good summary, but I'd just add:
Cocoa was a religious and prestige drink in Mesoamerica, but chocolate drink and houses to do it in were almost as popular as Coffee Houses in Europe, so as well as Religious it has Amenity, Cultural, Political consequences (people sitting around drinking hot chocolate OR coffee tended to get into political discussion - there were several governments in 17th - 18th century Europe that debated banning coffee and chocolate public houses for 'security' reasons!). Frankly, I would have given it a Bonus related to Religion rather than Housing or Growth.
Diamonds are probably one of the most extreme Luxury/Amenity Goods in price per gram, and any large diamond attracts almost religious cult significance - look at the legends and stories surrounding the Hope Diamond or the Koh-i-Noor: great named Diamonds are, literally, Priceless.
Ivory has the obvious association with Elephants as War Animals, but again that is the simple and popular view: Elephants have also been nearly irreplaceable Work Animals for at least as long as they have been drafted into the military, to move large heavy things and aid in both regular and monumental construction. I would have been tempted to give them a Production Bonus, especially for Wonders.
On a related note, has anybody noticed how many of the Great Merchants in the game already are directly associated with a specific Luxury/Amenity Resource?
That begs the question, is there any sign that those relationships are going to be exploited in any way by the new Mode for 'extra' Bonuses?
Just at a glance, here's what I could see:
Colaeus (Kolaiois) - Silver Resource
Zhang Qian - Silk Resource
Jakob Fugger - Silver Resource - making better use of it, anyway: he's associated with the
Joachimthaler silver coin that became the 'standard currency' in most of Europe
John Jacob Astor - Fur Resource
Melitta Bentz - Coffee Resource
Levi Strauss - Cotton Resource
Some of the other Great Merchants could also be used to 'enhance' Corporations: the bankers Bardi and Medici and finance minister Todar Mal are obvious, but also Adam Smith and Sarah Breedlove for Theory and Marketing and Rockefeller, the ultimate 'Monopolist'.
It would seem to be a shame not to utilize some of these existing Great Merchants to add 'spice' to the new Mode.