2014.05.19:

The OEM price for the NLG664 is 6,640 Euros (excluding cables and VAT). Brusa will also require you to purchase a support package for 9,500 Euros (+ VAT). Hopefully that explains the lack of interest in the Leaf upgrade market.

https://speakev.com/threads/charging-a-leaf-with-22kw.2270/

Yes it's been done in the USA by a guy called ingineer. He also made a gas turbine Chademo station/range extender, upgrades EVSE's, and made a plugin Prius using A123 cells. He's a smart and busy guy!