The release of PostgreSQL has crept up unexpectedly, scheduled for September.

https://www.postgresql.org/developer/roadmap/

https://www.postgresql.org/docs/18/release-18.html

Beta images already available:
https://hub.docker.com/_/postgres/tags?name=18

Update - RC1 happened:
https://www.postgresql.org/about/news/postgresql-18-rc-1-released-3130

Docker images:
https://hub.docker.com/_/postgres/tags?name=18rc1

The planned date for the general availability of PostgreSQL 18 is September 25, 2025.

Due to a very unexpected turn of events, it was released on time again (every September, it's like "3-d september" song, but from PostgreSQL):
https://www.postgresql.org/about/news/postgresql-18-released-3142/