World War Z is a film that has had quite a bit of trouble with it's story. It had to go through rewrites, re-shoots and the release was pushed back to its current date of June 21, 2013.
According to reports the film had problems with the ending. That was when Damon Lindelof was hired to rewrite the third act. Lindelof "cracked a potential new ending", but Drew Goddard actually wrote it.
After all the setbacks finally some footage is coming out, and it looks awesome so far. Thursday, Entertainment Tonight will have an exclusive first look. As soon as it is available I will post it here. I love zombie movies and am definitely excited about this one.