Not much to say about this except that he's probably going to function as a late inning defensive sub/pinch runner, though I must be honest in saying this makes no sense.  He's probably not ready and they just burned through an option to bring him up.  They have other options in AAA who are more likely to contribute in some manner, such as Jacque Jones or Dustin Martin.  I'm wondering if this is to showcase him, but other than that, this move makes little sense.