When they announced that there would be a fourth Jason Bourne movie (The Bourne Legacy), and that Matt Damon would be replaced with Jeremy Renner, the world collectively scratched their heads and went "Ummm ... what?" Well, the new trailer more or less addresses this issue, stating that there's apparently multiple Jason Bournes and something about a shadowy government conspiracy, science, guns, and yadda yadda yadda ...