In the post-credits scene of the series
Homura is seen wandering the desert where the scene concludes with her sprouting dark wings and flying off.
After seeing Rebellion, this seems connected in that
it takes place in Homura's rewritten universe after she becomes a demon, which is what the wings represent.
I'm not too sure though, what confuses me is that Homura is
still wearing Madoka's ribbon in the post-credits scene, while in Rebellion she gave it back in the end after her "we may end up enemies" speech.
Ultimately, what does this scene represent now that Rebellion exists?