Honestly, I have no Idea but they have been working on this for quite a while
and not long ago they released a trailer which means they are definitely at a point where it's becoming somewhat close to done and they should be doing beta testing a month or two or possibly longer but I can say its getting close to done however they still need to look over the obvious things and add to everything as we all know it's going to be pretty customizable for creators but of course they will add to more things upon updates
anyways this is a mystery for the release but it's also very exciting hopefully its not that far away