Tiki 29.0 will be released in June 2025.
It is a Standard Term Support (STS) version and will be supported until Tiki 30.1 is released as per the Tiki lifecycle policy
You can see the development page at : https://dev.tiki.org/Tiki29 and all the code commits here: https://gitlab.com/tikiwiki/tiki/-/commits/29.x/ once it will be created (in 2025-05).