FoundationDB Beta 1 is now available!
It will take a while to sort out all of its features, etc.
I should mention that it is refreshing that the documentation contains Known Limitations.
All software has limitations but few every acknowledge them up front.
You have to encounter one before one of the technical folks says: “…yes, we have been meaning to work on that.”
I would rather know up front what the limitation are.
Whether FoundationDB meets your requirements or not, it is good to see that kind of transparency.