There isn't much in this link in term of details, but it does specify that the new version of the citizenship test study guide should be expected for later this year :
https://www.thestar.com/news/canada/2021/06/26/canadas-citizenship-study-guide-for-newcomers-is-getting-an-unvarnished-makeover-heres-how-its-evolved-from-1947-to-today.html
https://www.thestar.com/news/canada/2021/06/26/canadas-citizenship-study-guide-for-newcomers-is-getting-an-unvarnished-makeover-heres-how-its-evolved-from-1947-to-today.html