Sword Art Online's 18th light novel ships in Japan on August 10th. It's the fourth volume in the War of the Underworld sub-arc of the Alicization arc, as well as the final volume of the Alicization arc. Well, there's been Aincrad, Fairy Dance, Phantom Bullet, Mother's Rosary, then Alicization, and Dengeki is teasing something next for 2017.
In March, series author Reki Kawahara was talking up the excitement of moving towards the ending of Alicization. He was asked in response if there's more SAO after that, and he responded that he doesn't know, but that he'd like to write more.
電撃文庫 SAO18巻 CM！！— ユジ@SAOアリシ (@alice_ubw1101) August 3, 2016
そして！ 原作もまだまだ頑張りますよ！ アリシゼーション編最終巻、『アリシゼーション・ラスティング』は8月10日発売予定です。こちらもよろしくお願いします！ pic.twitter.com/r0GuCVzfAI— 川原礫;COMITIAむ16a (@kunori) August 3, 2016
Good choice by abec/Miki to call back to the first novel's cover art for this one. pic.twitter.com/g7ChE3Bk20— ultimatemegax (@ultimatemegax) August 6, 2016