Attack the giant has revealed a new illustration of Levi as part of the countdown for the episode that will air on Saturday, November 4. Studio MAPPA is working on the big finale. Satoshi Ikeda drew the illustration:

Yesterday, we saw Michel Sugimoto’s Pieck illustration, along with comments from Hajime Isayama, director Yuichiro Hayasho, Linked Horizon’s REVO, and Ai Higuchi.
Crunchyroll will stream it online Attack the giant Final episode and plot descriptions of special episodes:
The fate of the world hangs in the balance as Eren unleashes the ultimate power of the Titans. With a burning determination to destroy all who threaten Eldia, he leads an army of massive, unstoppable Titans towards Marley. Now, a motley crew of his former comrades and enemies are scrambling to stop his deadly mission, the only question is can they stop him?
Attack the giant based on the manga by Hajime Isayama serialized in Bessatsu Shonen Magazine from 2009 to 2021. The manga ended in April 2021 after 139 chapters, compiled into 34 volumes. The final, 34th volume debuted in June 2021. The manga was adapted into an anime by WIT Studio in 2013. Season 2 debuted in 2017, followed by a third season divided into two parts. The first season aired in the summer of 2018, while the second season began in April 2019. Studio MAPPA took over the franchise for the 4th season, titled Attack on Titan final season. The series began airing in December 2020 and has a total of 16 episodes. After finishing airing in March 2021, Season 2 was announced. Attack on Titan Finale Part 2 started in January last year.
Source: Attack on Titan official website
© Hajime Isayama, Kodansha/”ATTACK ON TITAN” Final season production committee