Since this is popping up in every forum, why not add it to the S3 forum :p
If it hasn't been pushed for your device, don't want to wait?
Grab it here
on 04/10/2013 – Made popular on 04/10/2013
Thought I'd let everyone know about showing cool I saw on the Phandroid site. Some time ago google released an update to the Google Now app that allows the "Okay Google" hotword to activate the Google Now app from any other app including the lockscreen.
Well originally you had to wait for an update to the app which is being rolled out by account not area.