Well they've apparently got a new manga they're working on, Ura Dungeon Okusan, that happens to have a cameo of the merchant wife and her second husband. The backstory is completely incompatible with the events of Isekai Furin 2 though, given that the Demon Lord was killed rather than fucked into submission and by a completely different party at that, so we can only pray that they're retconning it out of existence due to how god awful it was.