I know this is going to be extremely hyped, especially if it comes with a camera and retina display. So, is it possible to walk into my Apple store the day it comes out and expect to get one? Can I pre-order one, and pick it up in-store on the day of release? Or can I only order online and have to wait two weeks for delivery? What's the best way to get it immediately? Any opinions? This will be my first time buying a product from Apple, and I can't wait any longer--I've gone my entire teenage life without a music device, and I will finally get one, and I need it as fast as possible!!