Originally Posted by DeadHead

Any reason why would keep an order like this secret?

Personally, I've could have seen the discounts, as a result of the 787 delays, compounded into a pretty good deal on some B777 or the next generation B747-8. DAL typically doesn't like being the launch carrier, but seeing as this is the next generation replacement aircraft to an aircraft type currently on property, there could be something to this.
Just not sure as to why they would want to keep it a secret, and as being a public company I figured it would only be a matter of time before it needed to reported.