Sorry for the double post but I figured I'd put this stuff separately.
There was also several other announcements (10 in total) today, here's a few. Full list here.
An eurobeat version of "Ashita wo Shinjite Mitai tte Omoeru yo" released on October 23. Will seemingly feature new outfits and a music video(?).
Yumeri and Shiori will release solo photo books.
10th Anniversary Live on December 22 at Zepp Yokohama.
All-time best album "Chouzetsu Shoujo☆COMPLETE 2010~2020" released on December 23.
Includes album version of "Ashita wo Shinjite Mitai tte Omoeru yo" and a new Koume center song called "NIJIIRO Road☆" (NIJIIROロード☆) to commemorate the 10th anniversary.