OO session in drupalcon London

Isn't there anyone doing a session about OO programming for drupal 7?

There was one in 2010 for drupal 6, and it was very interesting.


drupal.org quote:
In Drupal 7, some of this has changed: Drupal 7, for the first time, requires PHP 5, and there are now a few modules in Drupal that use PHP's class system.

How to leverage my modules with OO programming (like the views or apachesolr guys did).

What are best practices/pitfalls in drupal7 OO development?