Forget buying your GTX680 overseas, it's now available for order in the US priced only at $566.75. While we don't learn anything new from the product page, it almost certainly confirms that it's coming, and it's coming soon. The site is taking orders, so if you're interested in running SLI, now might be the best time to pick up 2 or even 3. That is, if your pocketbook can handle it.
You can view the product page here and check it out or even order some, as the orders are being taken "regardless of availability." If you do decide to purchase one, do you mind grabbing one for me?