Last week Lanna failed to carry out her assignment of killing the Thin Man, while Arya ran into one of the men on her kill-list, Meryn Trant, although resisted the urge to murder him just then. In the photo released we see Jaqen Hghar in the House of Black and Whites chamber of faces, looking typically unimpressed, while in the teaser theres a brief glimpse of Arya - not as Lanna - in the same room, saying: Youre no one. It seems shes trying to convince herself, and it probably means that well be seeing her take on another new identity before the season ends. She may, of course, still carry out the killing of Meryn Trant, perhaps even using the new face to help her, and could well receive some sort of punishment from the Faceless Men as a result to build her story for season 6.