Drupal 8 core introduces the concept of experimental modules. These are modules that are provided with Drupal core for testing purposes, but that are not yet fully supported. Experimental modules are included in the Core (Experimental) package on the Extend page of a Drupal site (/admin/modules).
Drupal.org Issue Queue
For starters have a look at the drupal.org issue queue for this module. Here you will find any active and past issues and features that we are working on.
If you are thinking of getting involved by contributing code, we are currently doing most of our development on Github under: https://github.com/FreelyGive/decoupled_auth and on several forks that can be found from there.