It seems like the only new harvestable is the Prairie Grass. They mentioned three new recipes in the Livestream, though, with one of them being Basegame. Since it included squash I wish they would have added squash as a harvestable to the game as well. We already have black, green and soy beans, but red beans would be nice too since chili is a common enough Western recipe and often made with red beans (or a combination). And a few more varieties of grape for the nectar-making would also have been nice, although I guess grapes don't really make sense for a Western pack in an arid climate because grapevines need so much water.
The Sims Team