Conference, Camp, or DUG: 
DrupalCon Portland
Date: 
May 21st, 2013

Drupal 8 will have a fancy new template engine (Twig) and a simplified theme layer. We'll show you the new syntax (don't worry, it's easy) and walk through how you can actually use Twig in your every day lives.

* Are you a theme developer? Come see how consistent, easy, and straightforward it will be to create your own custom themes.
* Do you maintain contributed modules? Come learn what you need to do in order to adapt your code for Drupal 8.

Resources: 

Presentations