No you can't. There's often delays in highly desired products, not to mention they stop their entire storefront when doing product launches ("We'll be right back!", but I won't since I can't order it right now). At least I can still use Amazon.com to order things.
Exactly. I don't even care if they're not selling it yet, at least have an informational screen up. I just went there to look up the specs on the new Kindle Paperwhite (weight, mostly) and the product isn't even mentioned anywhere on their site.
One thing Apple gets right is that you can buy a new product as soon as it's announced.