Citrus: It's all so clear now (my deduction).

[Louis XXIV]

if you look at the starting location you will see that there appears to be only one luxury resources from the base game (which I think is pearls, though it is a bit hard to tell) and while some starts will only give you one luxury resource it is far more common for the game to give you two luxury resources which leads me to believe that Citrus could quite possibly be a new luxury resource!

Which starting location?

ETA: I assume you mean the demo. Do all starting locations always get two luxuries? Also, keep in mind this is likely a custom scenario.