Creating a new theme for Drupal core
Drupal 8 will ship with one front facing theme, Bartik. While there's nothing wrong with Bartik besides it's age, the process of getting it into core was difficult and painful, and we should be able to 'freshen up' the default look and feel of Drupal to keep up with the times.
If you attend this session, be prepared to contribute to the discussion there are a lot of issues we can discuss:
Should add new themes to Drupal core?
How can we attract designers who rock?
How do we develop and add new themes to Drupal core?
How do we maintain them to keep up with our evolving best practices and trends?