From what I know of a "demi glaze" I'd assume it's sweet. It's a french brown sauce that they put on meats, and from the title- I'd say it's a slightly sweet sauce made w/ veal stock.
At Disney you can order just about anything without something if you don't want it!
Demi Glace is a type of sauce that is made with stock (and other things but I am not going into the whole process, cause it takes forever). It's cooked down until it is thick and shiny. It's savory more than sweet but there is a bit of sweetness there from the caramelized vegetables in the stock that is initially used.
It's absolutly delicious. No spice at all. Most people really love it.