Amanda, I can't speak for the new plan. As of this moment, any kind of potato, including sweet are limited to once a day. You can still have a grain at the other meal without counting points. This might be a good time for a barley dish!
I hope they hold your order and send the new materials that will be coming out next week - new plan and Core is going away as we know it. It'll be in a new form. I got those 19 cents per pound sweet potatoes, too. I love to have one with dinner.