Feed your entire culture and industrial supplies

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http://asidcast.com/civilization-6-is-on-its-way-with-surprises/

So if Port of Houston sits in a lush valley bisected by a wide river, you could till the earth, build channels, and unlock a food production boost to feed your entire culture. Meanwhile, Sierra Nevada rests next to soaring mountains, earning it the ideal spot to mine for industrial supplies, thereby producing the equipment necessary to defend both cities.

To me it sound like production may have been renamed industrial supplies or it could be a resource you then turn into production similar to minerals in Pandora First Contact or Wood in Civilization Colonization. It clearly sound like food can in some form be transported between cities.