Not to be a debbie downer but I hope that your dealer is being completely truthful, as many members on here have had some bad experiences waiting on their Z's. Assuming it does come in soon, inspect it to make sure its exactly what you asked for! Otherwise, welcome to the LI Z community, see you out there.
Oh, and garage your car if you can! If you cant, invest in some good wheel locks. Long Island Zs have been hit hard by some douchebags stealing our wheels.