User blog comment:Moussman360/Regarding volume 2 spoilers/@comment-3257939-20140413212338

People, there is something you need to understand. The opening will be officialy released with Episode 1. And one episode won't be enough to introduce all the characters that have or have not appeared in the leaked video.

For example, we saw Ren and Nora in episode 4... no, we saw them in episode 1 in the opening.

The same thing will happen with the characters introduced in opening but not in episode 1. We'll just have to wait anyway to see them or actually hear their voice actors.