The word expansion sounds promising to me, and them saying "the first expansion" implies something different from the usual DLC, so its safe to assume this will differ in both price and amount of content. Which reads to me like it would come with something more complex as the WE, otherwise why would it be a expansion? And if thats the case and it really introduces a new aviary system, calling it gamechanging isnt overselling it imoTaking it with a grain of salt, but this would be huge news. Game changing? maybe to some, but it's a "gimmick" phrase more than anything to me. It won't be game changing, but it might just be game completing.
But yeah im trying to not hype myself up to much since there is still a really good chance this is troll/fake/whatever