Recently when a new restaurant is opening, they'll announce an opening date and a date they will begin taking reservations. I'm 99% sure that how they handled introducing Via Napoli and La Hacienda de San Angel into the reservation system. Since we don't have a firm opening date, and it will probably be several more months before reservations can be made, you might want to plan to leave a day open for Be Our Guest in case it's open during your trip, or plan a meal that you're willing to cancel in order to switch once opening dates and reservations are announced.
By the pictures of what's done, I can't imagine them having it ready then. I'll bet they have soft openings the beginning of December at the earliest. (Just my opinion on how long it might take to complete construction)
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