Based on the solicitations for upcoming issues, it sounds like King Seesar and other ancient monsters will be appearing soon. I hope this means Gorosaurus and Kameba will get a chance to shine, as they only had fleeting cameos in issue #9. I'd always welcome more Baragon too.
It's almost to the point where you can name a Toho kaiju and find an issue of
Rulers of Earth that gives it some time in the spotlight. I wonder if we'll see Kamacuras or Ganime at all before it ends (so far they've only appeared as cave paintings).