Just to clear things up, I have the monthly subscription and Ultra Engine is fully functional with it, sure - it's not 100% ready yet, but I can already do amazing things with it, even games.
Then I also ordered Leadwerks Engine just for enthusiast reasons and perhaps for some backward compatibility with older machines, and all its asset packs from Steam.
And finally I bought the standalone Ultra Engine Standard Edition as a pre-order, which has not been released yet.