Be careful: Potential spoilers on "Game of Thrones" season 7 will follow! HBO recently released a new "Game of Thrones" behind the scenes video titled "Inside Game of Thrones: A Story in Cloth". The video contains an interesting detail about what is going to happen to Arya and Sansa Stark in the next season of the show. Although we cannot be sure, we think in this video may be hidden the face Arya is going to wear when she will arrive at Winterfell.

'A Story in Cloth': check out the video

If you haven't watched the new HBO's behind the scenes video, you can watch it below:

Arya's sword is hidden in one of the scenes

If you watch carefully at the picture above you can see someone framed in a red rectangle who is carrying Needle, the thin sword Arya named that way as an ironic reference to her hatred of needlework.

The mysterious woman is just a step away from Sansa but we don't know who she really is. Since Arya is extremely attached to the sword Jon Snow gave to her in the first season of the show, it's quite unlikely that the young Stark handed it over to someone else. We should also consider that Needle is easy to recognize and Sansa saw the blaze multiple times.

From the "Game of Thrones" season 7 trailer, from other set photos and from this very screenshot featuring Needle, we know that Arya will be back in Winterfell in the next season of "GOT", therefore, we can speculate that the young Stark is actually the mysterious young woman in the picture, wearing a new face. If you think about it, it would make sense for Arya to enter Winterfell with a different face, since the castle's situation may be unclear for her at the moment of her arrival.

Why we can't be sure the girl is Arya

Although the idea of Arya lurking around Winterfell wearing someone else's face (maybe plotting with Sansa against Littlefinger) is really cool, the girl behind Sansa in the clip may be a set person. According to several fans, the woman may have replaced Maisie Williams in the clip just to avoid spoilers (since Maisie's presence on the set would have confirmed Arya's return to the Stark's castle).

The woman could also be someone who is carrying Needle around after Arya has her sword taken away for some reasons.

When will we know the truth? According to what the leaker "awayforthelads" wrote on Reddit a while ago, we will see Arya arriving at Winterfell during the fourth episode of the next season. Don't forget: "Game of Thrones" season 7 will premiere on July 16 on HBO.