Dark Knight Teaser Before I Am Legend (VIDEO)

Coming to your nearest IMAX: A seven minute long segment of The Dark Knight will be shown before I Am Legend.  It will be a complete scene, not just along trailer, It’s called a prologue about the Joker.
In A Dark Knight, Batman and James Gordon team up with the new DA, Harvey Dent, to take on The Joker, whose crimes have become more deadly.  The film is scheduled for release in July of 2008.  If this scene teaser works, it maybe come a new way to create buzz for blockbuster movies.