Chimi-chara specials of volume 8…focused on? not one character, but four (at least? ). We have Hannah and Franz in the first part, Mina in the second, and Hange in the third.
Is there Jean? From the initial look of the available screencaps, I say no; though maybe he’s in the background of some scene somewhere.
With even minor characters getting a voice appearance, maybe the former Levi squad will be in the next volume’s special? (kind of wishful thinking. 😛 ) More probable will be Levi and Erwin. (poor Thomas Wagner gets forgotten )
Screencaps courtesy of that blog. (additional screencaps can be viewed there)