Mohawk Games, the developers of Old World, have released a podcast interviewing Soren Johnson. Soren is the lead designer of Old World, as well as Civ4, so this interview should be intersting ;).
You can find the podcast here: https://mohawkgames.com/podcasts/interview-with-soren-johnson-design-director/
We have a thread in our forum for the podcast here: https://forums.civfanatics.com/threads/podcast-interview-with-soren-johnson.674526/