6.0
参考：
WordPress 5.9 がリリース、6.0 はどうなる？ | Capital P
What’s New in WordPress 6.0 – Features and Screenshots | WPBeginner
What’s Coming in WordPress 6.0 – Features and Screenshots | WPBeginner
WordPress 6.0 “Arturo” | WordPress News [Official]
Version 6.0 | WordPress.org Support [Official]
WordPress 6.0 Development Cycle | Make WordPress Core [Official]
5.9
参考：
WordPress 5.9 “Josephine” | WordPress News [Official]
Block Themes – a New Way to Build Themes in WordPress 5.9 | Make WordPress Core [Official]
ロードマップ
参考：
Tentative Release Calendar 2020-2021 | Make WordPress Core [Official]
Big Picture Goals 2021 | WordPress.org [Official]
Making WordPress Releases Easier | Make WordPress Core [Official]
プロジェクト
参考：
Feature Projects Overview | Make WordPress Core [Official]
リリースノート
参考：
Version 5.9.2 | WordPress.org Support [Official]
Version 5.9.1 | WordPress.org Support [Official]
Version 5.9 | WordPress.org Forums [Official]
ニュース
参考：
Releases | WordPress News [Official]
News | WordPress.org [Official]
過去の更新
参考：
3.6 から使える (であろう) ちょっと便利な WordPress 関数 | Simple Colors
開発
参考：
Roadmap | WordPress Trac [Official]
Next Major Release | WordPress Trac [Official]
Next Minor Release | WordPress Trac [Official]
Future Releases | WordPress Trac [Official]
Bug Reports | Make WordPress Core [Official]
アーカイブ
参考：