Look at 2:50, the name of the player is [b]oryx-bng[/b]. So one of the first trailer revealed the boss of the big addon before the game was released.
https://m.youtube.com/watch?sts=16696&utcoffset=120&v=gIp7vZuYzoA&oref=https%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DgIp7vZuYzoA%26itct%3DCDUQpDAiEwiW0Z2w7pfIAhUTmx0KHUKzBYYyC2M0LXZpZGVvcy11WhhVQzUyWFlnRUV4VjlWRzZSdC02dm56VkE%253D&has_verified=1&layout=mobile&client=mv-google
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Yeah oryx was a bungie dev's gt for some time now.