What influence do you expect the growing trend in wearable computing to have on user interface design? Will particular user interface design ideas, for example, become more or less significant when...

What influence do you expect the growing trend in wearable computing to have on user interface design? Will particular user interface design ideas, for example, become more or less significant when applied to wearable computing devices? Will there be any changes to user interface design concepts for these devices? Be precise in your response about the user interface design principle(s) you're addressing.