Why would a stationary, internet-connected device have a GPS receiver?!
No doubt something that will make all of us hacker types very happy, once we figure it out.
But unlike the Echo, the Home can send (well, control) audio to a Chromecast Audio (or two, or three, in sync!), which is far more versatile than having an audio output on the device itself. I've been using various Echoes (including a couple of output-jack-equipped Dots) since their first release, but the Chromecast connection is the primary reason why I purchased a Google Home.