What I don't understand is, the devs could have made the Lupin more beastly and more animal-like but instead chose to make them more humanoid. And why go through the trouble of introducing a Lupin in the first place with a event to then have a him decide to travel Eorzea and befriend its populace? If I recall correctly, it was the first time a "beast" was part of a seasonal event.

Lupins run like all the playable races, have some the same gestures/emotes as the playable races. And I know the expressions on their faces look bland but it could be worked upon. It looks like they are slowly integrating them in. With Kelgar too, being a part of Eureka, it just seems like the Lupin have more potential to becoming a new playable race than Viera even though fans want them more.Yes, the Viera is mentioned within 4.3.

New races will mostly likely always be a problem. This is a game and people want to play a fantasy where they can enjoy themselves. But whatever the case, it'd be nice to have a change to the playable races. It'd be new to see this happen. And it'd be somewhat unique to XIV. I'd enjoy it and hope it happens.

And, if Amaterasu does appear in the game, she will probably be a mount for collecting all the dog mounts from the extreme trials. But I feel as though Yatagarasu will be a thing in the future.