When does Reign of the supermen come out on here?
If you mean the upcoming animated film, I’m pretty sure it’s not due for release anywhere until 2019, so, unfortunately, we have at least three months of waiting. 
If you mean the comic series, I have a link to it right here:
https://www.dcuniverse.com/collections/reign-of-the-supermen
If you mean the 1933 story by Siegel and Shuster…I don’t know, but I agree it would be a cool addition here!
Definitely 2019. That’s when the Blu-Ray and digital copy comes out.
Cant wait for Reign of Supermen…DC ANIMIATION is, IMO, way better than Marvel’s animated attempts.