It's short, sweet and showcases the Battle Of Jakku.
The Battle of Jakku is a free, post-release download that you can get a week early if you pre-order. So it's a pre-order incentive basically. The good news is that everyone gets to play it eventually (one week later) so it's not one of those super dodgy pre-order incentives. It's no 'pre-order pants' that's for sure.