July has come to an end, and after the 1.9 beta series was finished, work started on the next version. 1.10 requires huge amount of work and it will be awhile before it's ready, and even before its main project is started (updating the world map), other tasks need to be completed. One of them is a new map line rendering system, which will replace both the map lines and track line renderers with a faster system which uses less memory. Also in the case of map lines it will bring new capabilities. Read more about it in the devblog:

https://carloscarrasco.com/nimby-rails-july-2023/