Now that the anime ended too and with its low rating of ~6.43 on My Anime List, I really doubt there will be more stuff about this.
Too bad the manga seemed to be only an ad for the LN, one which (the LN) I'll probably never read and it's not even because I can't imagine the actions and stuff that I'm reading in my mind, but animes and mangas do a way better job at portraying action scenes and emotions in my opinion.
Well... I'll miss The Survivors, but I'll miss Karan the most... she is the best character both in the anime and the manga, she has a genuinely innocent personality and not that kinda thing that looks like it's forced in most animes.