According to Kodansha web site, AMS Vol.39 will be released on 7/23.

Ref : http://shop.kodansha.jp/bc2_bc/release_schedule_comic.jsp#boys_13

ps. AMS was selected as the winner in the General Department of the
33rd Annual Kodansha Manga Award.  A bronze trophy plus one million
yen will be presented to Fujishima-sensei on 6/22 at Grand Prince
Hotel Akasaka, Tokyo.
Ref : http://www.kodansha.co.jp/award/manga.html

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'CuSO4' Yung