Cool project! About a decade ago, I had a job that involved entering data into an Oracle-based equivalent of this. I wish I could remember what it was, called but perhaps it is better for such a monster to remain nothing more than a myth.
The intention we have is to take what's right with the colocation approach and take the learnings of what was wrong with those before (such as the above or Illustra).
Essentially, we're aiming create a modern polyglot runtime that has an embedded database with all its functionality (Postgres), with a contemporary, lightweight D3X.