As far as I can tell, the Leaf never had this in the US. The 1st and 2nd gen hard the hardware, but the chargers weren't there. And the 3rd gen has only announced V2L.

From my perspective, "zero-interrupt automatic transition" is not that important, but being able to have the system smoothly move between having the solar recharge the car and the car power the house during an extended grid outage is critical.