Some confusion on the article's title:
Watch the Skies: David Koepp on War of the Worlds
Steven Spielberg on David Koepp's War
I remember a 2005 DVD exclusive booklet "War of the Worlds: The Shooting Script" which included a Koepp Q&A with Rob Feld. Nothing Indy but always a fascinating interviewee. Some other interviews:
The Shadow: Screenwriter David Koepp
Altman, Mark A.
Cinefantastique 25(4): 23. August 1994.
Writer of Rampages
Warren, Bill/Shapiro, Marc
Starlog 242: 70-73. September 1997.
Cinefantastique 31(4): 45. April 1999.