You can wake up the Nexus 5 with voice commands
 

"Okay Google." Those Touchless Controls aren't just for the Moto X anymore -- they're now part and parcel of the Nexus 5. With today's unveiling of Google's (terribly leaked) Nexus 5, we're getting a first look at Android 4.4 KitKat on the handset, and that OS update comes with some significant ...

http://www.engadget.com/2013/10/31/a...=rss_truncated