Plenty of interviews online for your reading pleasure. First there's a 2 part interview over at Comic Book Resources about Kingdom Come and Alex's return to these characters with Geoff Johns in the pages of Justice Society of America. Here's Alex's original comments about Kingdom Come:
'Kingdom Come' was a reaction to the current state of comics. The term 'super-hero' is a misnomer. It's more as though 'super-human' is the proper term for contemporary 'super-hero' characters, because 'hero' denotes some sense of ethics. And you won’t find ethics in your average comic book. --ALEX ROSS, 1997
Also at Newsarama.com, three of the new Vampirella series' cover artists Jelena Kevic Djurdjevic, J. Scott Campbell and Alex Ross discuss the character and their motivations behind the art for the first issue of the new Dynamite Entertainment series.