Answered in https://medium.com/we-distribute/faces-of-the-federation-christopher-allan-webber-on-mediagoblin-and...

So what happens with MediaGoblin? That’s a conversation I have to have with the MediaGoblin community. I’d be happy for this [Spritely] *to be* the future of MediaGoblin, but given that it’s a language rewrite I’m not sure if some people will be unhappy and will want to continue the existing codebase… which they’d be welcome to do.