Star Wars: Rogue One Sizzle Reel Breakdown - 33 Things You Must See

Given that Jyn and Cassian appear not to be running towards their enemy any more (they're looking over their shoulders) as the world explodes around them, it would seem that they've retrieved their mission objective here.

And that would mean that the object in Jyn's hand is the giant floppy disk form of the Death Star plans.

There's Alan Tudyk in mo-cap gear again behind them...