I've tried to be a little more conservative about my fanboy-ism when Material Design was launched, but man, you have to admit that they look amazing.
Play Store just got the update and aside from the great new UI what's really cool is that now the "What's New" section really stands out.
If you haven't got the update yet... I recommend you go bookmark this site: http://gappsearly.com/
They tend to have it almost as quickly as it's released.