Apple have updated iAd Producer to 2.1.1. Looks like mainly bug fixes and some UI tweaks.

This update contains various improvements, including fixes that:
• Correct handling of assets with normal and high-resolution versions.
• Address issues with animation preview on canvas.

If you’re a registered Apple iOS developer you can get it from the Developer Portal. 

You can also view the iAd Producer WWDC video, session 605 available on iTunes.