Star Wars Trailer: Why Is The First Order Attacking Rey's Planet?

The Asian market received a new trailer for Star Wars: The Force Awakens today and with it came a Star Destroyer full of new footage. Some of it looks like it may tell a bit more of a coherent story than we've been able to piece together thus far. If everything is as it appears in the opening minute of the trailer, it looks like The First Order makes an attack on Rey's planet of Jakku. But why? An early sequence in the trailer has our characters of Finn and Rey, John Boyega and Daisy Ridley, run...