You may have noticed a weird, subtle change in the opening:
We also see where this image comes from when Pride goes down the super secret lift:
Underground city! What is going on!
Thought someone might be interested. And randomly, I don't know if it's been mentioned, but Hiromu Arakawa recently drew out a "behind the scenes" sort of thing, and she seems unhappy in general with the anime. I don't blame her. If you can't find it, here's translation notes and a link to the scanlated pages.