As I mentioned here, there was a report in The Ivory Informer fanzine that Brent Anderson was going to do the art for Supreme: The Return #4. However, he never did and Matthew Dow Smith ended up doing the art instead.
My friend Rob recently asked Anderson about the missed opportunity and was kind enough to pass on the exchange:
Q: Hello! I'm a long time fan. Been a reader of Astro City since the beginning! I've had a question for you for almost 20 years. I remember that you were named as an artist for one of the last few issues of Alan Moore's Supreme run. Unfortunately it never happened. Could you please clarify what went down. Did Rob ask you? Did you do any work on it? What issue was it? And finally why didn't it happen? I appreciate any answer that you can give. Those Alan Moore comics from Awesome are some of my favorites! Thanks!
A: It has been a long time, but I recall I was sent two scripts and asked to pick a favorite between them. They were both excellent and I couldn't immediately choose one over the other. While I was dithering, I guess the series ended, and there was no follow-up. I never did get to have a conversation with Moore. I still have the scripts and refer to them now and again and marvel at how adroit and accomplished a writer Alan Moore really is! I hope this info is useful to you. Best, -B.