I'm banking on Cuba simply because the implication was that revealing the resource would give away one of the new civs.Still banking on Cuban cigars for Cuba. Mostly because all of the other horses in the race are taken
Now when they say that I imagine they mean it'll be obvious to the layman Civ player, so stuff like dates = Morroco and glass = Venice are likely not what they had in mind.
Or it could just be buffalo but that'd be pretty dull.