I haven't personally used the new macOS Sierra preview yet, but one of the things I am looking forward to is the possibility that Siri on the Mac will open the doors for Google Voice Search (Google Now?) on the Mac. Not too long ago, Google disabled the always-on functionality of Google Voice Search in Chrome which was sorta sucky because I always liked using that. Pretty soon, Siri will have an always-on setting which makes me hopeful that Google will release something to counter it. Maybe a standalone application that allows me to replace Siri with Google Voice Search? That would be nice.