It seems there was an interview we overlooked from this year from March (part 1) 2014 and April (part 2) 2014 edition of the Monthly Conan Newspaper:
http://meitanteikonanplot.blogspot.in/2014/03/special-post-two-part-1-interview-with.html
http://meitanteikonanplot.blogspot.in/2014/04/special-post-two-part-2-interview-with.html
Highlights are...
• Fusae Campbell is not the boss.
• One of the goals of the Black Organization is control of a lot of money, and not as much world domination.
• Confirmation that men's Black Organization codenames are distilled alcohols, and the women are named after "sweet alcohols". Codenames are done that way because it is cool.
• Gosho "talks" through characters like Haibara and Kogoro.
• Extensive description of Gosho's process for how he comes up with tricks.
• How involved Gosho is in the anime and movie creation process. (Fairly involved)
• Gosho's lifestyle and how busy he is.
• Gosho's chair spinning superstition
• Gosho talks about sports he likes