I'm already in love with Material Design.
I seriously wasn't expecting that. The exposed hamburger menu looked horrible to me in the leaks but the final, animated result... well, I'll be damned! Everything looks so nice: the iconography, the bitmaps, the stylization are like a throwback to 60s pop art combined with Dutch design and abstract minimalism. The bold colors that inherit from the context are also a joy.
All the while, it remains recognisably Android.
All hail Matias!