Mark Evainer reports that there is a Shazam! movie at his site here http://www.newsfromme.com/archives/2006_04_15.html#011340
In it he says that Wallace Shawn would be perfect as Dr. Sivana. I like Mr. Shawn but I really think he would be best if they were going for camp humor. However, if you could make Patrick Stewart look shorter I think he would be better for the role. I also hear that "The Rock" is up for Captain Marvel. That might work as he does look the part. I just hope they give some of the actors from the old saturday morning show a role too.