Just a general heads-up that we plan to roll D8 alpha 4 on Friday, October 18, both since it's been awhile, and also in order to have something stable to port modules from during the various sprints/sessions at BADCamp.
Now's a good time to wrap up anything you've got in progress that's pretty close, so we can show the world a new and improved D8 since alpha 3 at the beginning of September! :)
Here's a list of issues to help with! https://drupal.org/project/issues/search/drupal?issue_tags=8.x-alpha4