It looks like Nova Launcher has been updated on the Play Store to include Google hotword detection. Now in version 3.0, Nova Launcher says that its Google hotword requires a device running Android Jelly Bean or later.
In addition to Google hotword support, the update also brings more flexibility to Nova Launcher. Now, you have more flexible subgrid positioning for layouts, dynamic calendar icons, and color options for icon labels, tabs, and backgrounds.
Grab the update for Nova Launcher and let us know what you think!
Thanks for the tip everyone!