Yeah, as soon as I read those patch notes about the Stables, which haven't been updated in eons, my first thought was that it seems like they took some inspiration from your add-on.
Will have to see what all it adds, but I like that your Add-On adds the diet, setting favorites, and the idea of Beast Squads is super cool for people like me, who sometimes swap active pets for thematic or content purposes. And while I have no idea what the Beast Tamer's Guide was supposed to add, the idea of having an in-game way to find and learn about the different pets would be absolutely fantastic.
So, let's see what they do with Stables, and I'll keep an eye on your Add-On to see what you do next.