As I said in the other thread, the question is now whether we're just going to see DMs Guild and PDF support, or whether, once the psionic and artificer rules are set, we'll be seeing something more substantial in the way of an actual published book. I have a feeling that once the necessary rules are in place (with a likely rules expansion book early next year for new classes and races), we'll be seeing a full book, and this is just to whet the appetite and get things started...