The VOIDRUNNER'S CODEX is LIVE! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
AFAIK, nothing official. There was something in a Dragon magazine that proposed ECL's for all the MM entries, but this was simply a proposal. I have not seen anything come of that yet.