Could make IoT make sense after all, if each device come with their own switches across an open protocol rather than rely on proprietary apps.

This is a cool idea. I'd love to see it easy to create apps that can communicate using something like this and/or Bluetooth mesh networks

This is nice, but let's not get our hopes up. It could have the same fate as Mozilla's Persona that was released couple years ago.

How is this different than just an ordinary old http service advertised on mDNS? Is it just the idea of listing nearby ones in a browser's UI?

I wonder why this doesn't use WebRTC (at least it wasn't mentioned)?

This is the next step after cordova-like development tools to create networking crossplatform web app. I like it. My only concern is about security

This is a repackaged idea that has many incarnations including one I built. People have been thinking about this sort of thing for years.

This is a security nightmare. You now have an application -- a web browser -- that can be turned into a server by any malicious person with even a modicum of skill. It means that any other part of the payload no longer has to worry about setting up services, etc to covertly communicate back to the main site, that's all handled by the browser, which now has all the proxy settings and all of the keys to do so like any other traffic. This is just a terrible idea for very marginal benefit.