Edit: Quantum paper has been replaced with Material design: https://www.google.com/design/ It’s Awesome!
Seems like I go and and on about the hamburger icon, but thankfully it looks like the new Google design language is stabilising into something really awesome called Quantum Paper. Google has realised that the hamburger icon needs a little help, but they are not throwing the baby out with the bath water. It’s still there, but it’s more exposed and more icon looking. Yay!
Liam Spradlin from Android Police goes into more detail about how they are rolling out the platform independent UI design language based on their framework Polymer: