Even though Google Analytics blog stated a few hours ago that the changes we saw are only minor UI enhancements the great news came from Avinash Kaushik blog that announced and detailed the list of new features:

1. User Interface refresh.
2. AdSense now integrated into GA. (private beta only)
3. Advanced visualizations: Motion Charts!
4. Custom Reports!
5. Advanced Segmentation!!
6. The Google Analytics API.
7. Automatic importing of AdWords cost data into Urchin.

Go check all the juicy details (screenshots and walkthroughs) on the new features on Avinash’s blog

UPDATE: Here are the official posts from Google Analytics blog and Adsense blog

Via Techcrunch here are some videos presenting the new features:
AdSense Reporting in Google Analytics

AdSense Reporting in Google Analytics

Advanced Segments in Google Analytics

Motion Charts in Google Analytics