No always listening Google Now on both Nexuses?

I recall hearing it is available in both. Someone else can confirm but I swore I heard them mention this today.
 
Where? I have watched the presentation vid (only the Nexus unveiling part), I did not hear anything.
 
They talked about a new Sensor Hub chip, but I don't recall them talking about or demoing any 'OK Google' commands with the screen off. The guy doing the demos had his screen(s) on at all times.