Well, why wait. I made a repo for "Electrino":
https://github.com/pojala/electrino
Sorry, it's totally empty! But I'm hoping to get around to making a Cocoa+WebKit proof-of-concept this week. I guess the starting point would be to implement just enough APIs to be able to run the main.js example from this Electron tutorial:
https://github.com/electron/electron/blob/master/docs/tutori...