I heard about this last night, but just thought it was a bit of idle gossip (though if anyone were to know, my source for it would be amongst them). But, anyway, confirmed today by Nashville types that the LEAF is to get a 6.6kW charger for 2013:
http://www.greencarreports.com/news/1063015_nissan-leaf-news-electric-car-updates-coming-for-2012-2013
Then, for 2013, the Leaf's onboard 240-Volt Level 2 charger will be upgraded to 6.6 kilowatts (from today's 3.3 kW), considerably reducing the time needed to recharge the lithium-ion battery.
Nissan's director of product planning, Mark Perry, had said in March that the charger would be upgraded "in a year or so."
Now Katherine Zachary, Nissan's senior manager of corporate communications, has confirmed that to mean for the 2013 model year.
http://www.greencarreports.com/news/1063015_nissan-leaf-news-electric-car-updates-coming-for-2012-2013