I noticed this yesterday when I checked my Adsense account. A pop-up came out asking me to try the new Adsense interface.
The new interface looks good even if it is still in beta stage. Well, the old one looked... old. The interface is very basic, just using basic HTML. This new interface looks modern. It even has graphs letting you compare your estimated earnings, ad unit impressions, coverage, clicks, CTR, CPC and RPM everyday.
I'm hoping for more improvements to this new Adsense interface as it comes out of beta.