The latest Saint Seiya manga (also known as Saint Seiya: Knights of the Zodiac in English localization) has announced it will resume, having ended in 2018.
The February 2020 issue of Champion Red (via Anime News Network) revealed that Saint Seiya: Next Dimension – The Myth of Hades would be returning to Weekly Shōnen Champion.
The most recent main manga of the series (Saint Seiya: Next Dimension – The Myth of Hades) started in 2006, and ended in June 2018. The original manga launched in 1986 and went untul 1990.
A release date was not revealed at this time.
In addition, the original Saint Seiya manga will have a re-release in Japan in 2020. This “Final Edition” contain both the original manga, along with new cover art and new original stories.