Google has polished the user interface with its new “Material Design” model of animated surfaces existing in different layers. It’s improved performance with a new, backward-compatible runtime that’s more battery-efficient. And Google has added features such as contextual unlocking that can take advantage of, for example, nearby Bluetooth products to know if it’s in a trusted zone.

http://venturebeat.com/2014/06/29/as-androids-reach-expands-google-attracts-fewer-pioneer-partners/