The evangelism update offers "Internet of Things" possibilities as one good reason for this development: https://github.com/iojs/evangelism/blob/master/weekly-update...

Current mobile processors are fairly powerful; some of them are faster than low end notebooks. I'd love to be able to test apps on the tablet and plug the tablet/phone to a monitor and keyboard to write code. Given that I write a lot of server-side JS code, iojs working on ARM64 is exciting to me.