It needed a new name because it has a new recipe and flavor. Despite what indications you might get from the seeming random duration of shelf lives depicted on

It needed a new name because it has a new recipe and flavor. Despite what indications you might get from the seeming random duration of shelf lives depicted on drink "best by" dates, sodas can easily spend a year or more in channel. So there had to be a clear indicator of whether you were getting the old or new drink.