The PlayStation blog showed in two videos in promotion of the upcoming DLC, The Last of Us: Left Behind, and it looks really enjoyable.
The first video is the opening medium of the game, showing Ellie and a clearly younger Riley at the military camp where they met. The second video is like a behind-the-scenes video with the voice actors of Ellie and Riley.
Hope the DLC will be as interesting as the videos look and will really add upon a high level of excitement once out.