So that's what the post-Yotsuba&! version of Azumanga Daioh looks like. The minimal design, resembling a high school textbook, eschews the more conventional style used in the MediaWorks covers. I wouldn't mind getting my hands on Shogakukan's 10th anniversary editions partly because they will most likely not be reproduced in English by Yen Press (here). But I'm also enough of a nerd to want to own at least one Japanese language version of a preferred manga.
Update: Here are the rest of the Shogakukan covers: