Version 14 adds some features to recursive CTE expressions to do BFS/DFS searches and cycle detection. As always, depesz has a nice write up of it: https://www.depesz.com/2021/02/04/waiting-for-postgresql-14-...

I _think_ it's just syntactic sugar and doesn't let you do anything you couldn't already do, although perhaps it would leave room in the future for the Postgres team to optimize query execution.