Calypso: Direct and full interfacing to C++

[Kagamin via Digitalmars-d-announce]

Aren't objects rarely passed by value? What's more interesting is 
how return by value is supported as it happens often:
1. return by value from D callee
2. receive an object returned by value and assign to a new 
variable
3. receive an object returned by value an assign it to an 
existing variable
Is ABI for these implemented?