Well, I have not ever pre-ordered a car before either, and I will not be pre-ordering this car either
Anyways, if that particular dealership isn't taking orders, perhaps they at least have a list you could get on, so that when they do decide to start taking orders, or whatever they do, you will get first crack at them.
If they aren't going to be doing anything like that, search around. A few people on the board have had success with pre-ordering, so there are dealers out there who do this.
If you do pre-order, and they require a deposit, BE SURE IT IS FULLY REFUNDABLE! You don't want to have something come up, and you suddenly can't afford the car and you're out $500 for no reason.