I've never quite understood the whole "developing on my phone/tablet" thing. It's like calling my keyboard/mouse a "development machine". I'll be impressed when I see someone actually switching to their phones for development: compiling, testing and running all on the device itself.
I'm sure we'll start to get some. Surely some members of the phone generation are more devastatingly dexterous on a phone than a keyboard.
Perhaps the typical university path makes it less common? I'd imagine the autodidact path might be more likely for a new breed should the new breed even exist.