User blog comment:B214/High School DxD BorN episode 1 review/@comment-16281343-20150407224228/@comment-24502975-20150407231048

So volumes 5 and 6 will be used to build-up half of v7, in particular the backsetting regarding Akeno's past and the Norse myth's entrance into the series. Nice.

Ishibumi himself said that he thinks JD's gonna look even better in BorN than it was in v6, so I don't think we need to worry about that.

Another interesting thing to note is that Ishibumi stated that any scenes which were skipped in BorN could be re-added in future seasons. IE, how they took the conversation with Kiryuu from v3 and put it at the start of BorN. So there's still hope for the finger-sucking scene and the oppai sandwich and anything else we might miss out on (including Saji's feelings for Sona probably). Especially if season 4 is 2-cour since they can use that extra time as an opportunity to resolve all of that.