The manga’s latest 95th tankobon volume is set to be released in Japan on October 18.
You can send your question via this form until 24:00 on October 14 (JST), then Aoyama’s answers will be published in the forthcoming “Detective Conan SDB (Super Digest Book) BLACK PLUS” to be released this winter.
Any kind of questions are welcome, like “Why black, instead of red?”