Attack on Titan manga receives an additional Volume - What is Isayama cooking?

Attack on Titan manga will have brand new content with an additional volume to the manga. Here's a guess what Isayama might be up to

Attack on Titan manga receives an additional Volume - What is Isayama cooking?

quot;Attack on Titan" manga series concludes nearly 12-yr run

Attack on Titan, Volume 1 by Hajime Isayama, Paperback

Attack on Titan Manga Volume 25

Attack On Titan, Volume 5 - By Hajime Isayama (paperback) : Target

Attack on Titan: Junior High - Wikipedia

Attack On Titan 15 - By Hajime Isayama (paperback) : Target

Attack on Titan Manga Volume 16

Attack On Titan, Volume 18 - By Hajime Isayama (paperback) : Target

Attack on Titan: Lost Girls The Manga 2 (Paperback)

A Village in the Mountains — Shingeki no Kyojin Fake Volume Previews and Extra