Been jumping around to see if there was a version later than 0.4 from 2018. Can you give us a more specific window than "very soon"? I want to know if I can expect to play it or try it within the next few months. But I'm gonna be candid. If I don't know when, then I probably won't remember and forget about it.
At the very least, if you have a later version, it might be nice just to release it to your fans/followers even if it won't be like your new prototype. It seems like they have been waiting so long that they are giving up hope. Throwing a proverbial bone might ignite that fire again.