We have a test environment available now to test the new code that is ready to be deployed and solves the problems with 6.x core patches and a number of contrib problems. It does not solve the problem with loading contrib dependencies. That's our next task.
The drupal.org copy is at http://rfay.redesign.devdrupal.org. Follow the instructions on the basic auth popup to get in (drupal/drupal).
You'll need a password to get in there unfortunately (to log into the drupal.org copy itself). Please contact me on IRC or via the contact page and I'll give you your account password.
The qa copy is at http://qa.scratch.drupal.org
If you'll try out your favorite patches- retest them, add new patches, etc., (most recent patches are out there) and see if the result seems correct that will be great.