Ashes of Anriandel is the title of upcoming DLC for Dark Souls 3. Bandai Namco and From Software have confirmed officially that it will be available on October 25 for Playstation 4, Xbox One and PC. It's going to be the first of the two expansion packs planned for the latest Dark Souls installment, with the second one coming early 2017. Both of them are included in the Season Pass but you can also get them separatedly.
Dark Souls III: Ashes of Ariandel - Announcement Trailer
Those of you that didn't have enough with the original game will see the game content expanded with a new location, the frozen wasteland of Ariandel. It's a barren land defiled by a mysterious evil that you will have to defeat. At your disposal, there will be new weapons, armor sets and magic spells to experiment with. Also, Ashes of Ariandel will include new features for the game competitive multiplayer mode, like a Player vs. Player arena called "Immortal Competition". We highly doubt that your copy of Dark Souls 3 is forgotten and getting dust somewhere in your room, but even if it's like that, you should be excited and already be preparing for the extra content coming this fall. After all, it's more Dark Souls 3!
answering the message of