I do not think Pono is doing anything new. There are places selling high resolution files, and many players that will do them (including portable DSD players, which the Pono won't do). None of it is free though given you may need 10x the space, which is an issue mp3 solved relative to even CD quality. In addition, if the mastering is bad (and most mastering is bad these days), the results won't be that great.
It is good that people are caring more about the actual sound these days (beyond "is it loud").