This is where I'm at with it as well, especially given how well everything seemed to be lined up beforehand. Datamined mounts/pets/armor was found encrypted. The name was found due to a marketing js that was prepped for pre-orders. We almost certainly don't have another patch coming out with new content, so it's unlikely that it's a secret pre-order bonus as was theorized with Dark Rangers. And with each passing week hype dies down some...Blizz has to know this, it's what happens with every single announcement.
Blizz have never exactly had an issue releasing an extremely early pre-order & putting a fairly late date on it before, so why now?