Maybe. But, as Yoav said, animal packs seem to be released relatively sooner than scenery. My guess is that animals are easier to recreate than scenery because the scenery needs so much detail to look good in every aspect; authenticity, usage, and even culture...Yeah true but they probably delayed the Twilight pack so it can release around halloween. I rememver there was a longer wait than usual between conservation and twilight
In the case of animals, it seems like it's easier to change the skin and tweak the model