Adam Holinsky says that he thinks it will be earlier than that - but I'm not so sure. I guess though, at least Blizz is saying that it won't be any later than that, but it could be earlier, which at least gives you some reprieve from the fear of recurrent delay of release.
So I went out and got my Deluxe Digital edition just now. Can't wait to get home and have a look at my new pet and mount. A stark reminder of how lazy I am when it comes to getting Anzu - which I still haven't been bothered to go back and get.