I know a lot of people can't wait for this zombie flick to hit the theaters, myself included. The story takes place in Philly, Pa. but the movie was filmed in Glasgow Scotland. I did some research and found out why. Here's a statement from IMDB.com:
(Filming took place in several areas of the UK, particularly in Glasgow, Scotland with the streets made to look like those in Philadelphia with many American cars, trucks, taxis and street signage shipped in from the USA. The filmmakers originally planned to film in Philadelphia itself however, they pulled out when they were refused tax breaks