Heroku's way ahead of you... https://github.com/heroku/heroku-buildpack-nodejs/blob/a77cd...
EDIT: To clarify, though I haven't tried it myself, it looks like you can just specify `"engine.iojs": "1.0.0"` in your package.json, and Heroku will install the entire io.js system for you.
Came across this just before opening this thread, you are correct https://twitter.com/hunterloftis/status/555234067520565249
Re:Io.js 1.0.0
by tlrobinson on Tuesday January 13, 2015 @11:48PM
(#8884365)
Heroku supports arbitrary "buildpacks", it should be easy to create one for iojs.
For manual deployment, the single iojs binary and your project folder should suffice, along with a way to start/restart your app automatically.