Super Niche Problem

Hey i could any new Nexus 5 Owners tell me if google now voice search activates when you click and hold the button on the headphones when the screen is turned off.

On the Nexus 4 it activates Voice dialer witch only allows you to make calls, i would love it if you could ask it thinks like "what time is it" or "text Joe on my way" with out taking the phone out of my pocket.