On groups.drupal.org/composer general communication takes place. It is good starting point for checking out the current progress.
We are maintaining packagist.drupal-composer.org that mirrors all drupal.org projects, ready to use with composer.
We are hosting the source code for Drupal Packagist and some other components on github.com/drupal-composer.
There are already some drupal projects available dealing with different aspects of Composer in Drupal.
You can support us by making a donation via PayPal .
This is a community driven project for Drupal.
Icons by various artists from the Noun project.