Senran Kagura series producer Kenichiro Takaki briefly touched upon the status of the upcoming Senran Kagura 7EVEN during an in interview with Akiba Souken.
Speaking to the website, Takaki said, "Recently, worldwide regulations regarding sexual depiction have been getting stronger, and in that respect, we have to make games in a way that they aren't misunderstood. Certain things are harder than they've ever been before. Given that, I think [the game] is going to take some time… We want to make it happen, so right now we're at a place where we're thinking about how to do that, and various other things overall."
More:
https://gematsu.com/2018/12/senran-...some-time-due-to-recent-worldwide-regulations