There don’t seem to be many new models in Legion so I’ve combined them all into one post.
The Dust Bunny used to spawn as soon as you clicked the Dusty Rug but now a number of them spawn outside the Barber Shop.
Not sure what the respawn time is but appears to be longer than an hour.
I went to great lengths to get a pic of that Crystalline Broodling – being 105 in a 110 zone. Multiple deaths and a couple of Spirit rezzes made it possible.