WordPress 4.0 was released last week with lots of nice usability improvements.
We've updated our WordPress Beginner class to cover the new features in 4.0.
Many of the improvements in 4.0 revolved around photos, videos and audio files.
Here's an updated video from the WordPress Beginner class giving an overview of the new photo gallery feature with live previews:
If you missed the 4.0 launch, here's a complete overview of what's new: