My understanding was that Parse (the company) has open-sourced an API-compatible re-implementation of their product as an act of kindness towards everyone currently using their system.

I may be way off base here, but there is no indication that this open source release from Parse is in any way a derivative of their commercial product... at this point whichever reimplementation of the Parse API gains the most developer mind share will survive as the winner. (Of course, Parse the company has a lot of inertia behind their own.)