These slides come from a webinar I delivered with Acquia introducing the primary change in philosophy from Ubercart to Drupal Commerce. With Ubercart, our foundational question was "What can I do with it?" With Drupal Commerce, it is "What can I build with it?"
This change is reflected in both our understanding of a healthy Drupal Commerce ecosystem and the architecture of the modules thus far. These things are covered in a few slides, and the rest of the presentation was a feature walkthrough of the demo site, http://demo.commerceguys.com/dc/.