The results are in and participants had a neutral or mildly favorable response to the content creation prototype. Participants found it easy to add content (create and edit) and it was clear to participants that the sidebar is related to the content but it is not central to the activity of content creation. This was good news to us! It confirmed that our direction was good and we where encouraged by all the positive feedback from the community.
We would like help bringing this to Drupal core in Implement the new create content page design. We need help on all fronts, but primarily in fixing a number of outstanding problems and carrying out code reviews.