One of the hard and fast rules of the dining plan is you cannot trade a dessert entitlement for an appetizer. In May some changes to the TS credits were posted on various websites, but not officially announced by Disney. Some changes have been noted in the 2016 dining plan brochures, but whether a restaurant is already allowing any of the changes varies with the restaurant. Among the changes is an option to exchange dessert at a TS for something else which the restaurant chooses, perhaps soup, salad or a side dish. So far I have only seen one person post that they were successful. At The Wave they were offered a specific vegetable side dish in place of the dessert. You will not be able to choose an appetizer from the menu, but you might be given a different option at a Disney owned restaurant this year if you ask, but less likely at the third party restaurants.