I think the hardware is just a gimmick. It gives the proposition more 'body' and is great for marketing.
But really, this is screaming to be an app. There is literally nothing this thing can do that the phone in all of our pockets can't. Especially integrated with our smartwatches for ease of use. So why have a separate device for it? It makes no sense.
I think the hardware is just there to make it not 'just another app' in the press, really. And that the app version will come soon after the physical product releases and will take over 99% of the installed base.
And of course if this takes off they'll be quickly acquired by Apple, Microsoft, Google or Samsung. I bet that's what they're aiming for.