http://www.quietearth.us/articles/2008/09/05/Post-apocalyptic-script-review-WORLD-WAR-Z

The guy reviewing the script seems to think the zombies in the film are going to be of the fast variety (although that isn't made explictly clear in the extracts offered) which would really suck.

I can't stress how much I want this to stop just being a script and starting being a film.