Until this device is officially announced, it remains speculative even though there are a couple of good reasons to expect this to be legit. One is that the listing shows up on Samsung's support site and two is that there is precedence for such a phone with the Galaxy S4 Developer Edition.
If you like messing around with your Android handset, flashing custom ROMs and the like, you might want to keep an eye out for news about when to expect the Developer Edition of the Galaxy Note 3 to launch. No doubt it is going to have a pretty high price tag so you might want to start saving up now.
source: SamsungSupport via AndroidCentral