I don't know that guy's situation since I didn't know of his story until now but there was not the healthy (w/low prices due to low resale value) market for Leafs until they started coming off lease. viewtopic.php?t=20293
was an example thread on early lease termination. OP, should consult their lease contract on what their options are and what they'd owe in each case. I don't have the bandwidth to write on this further as I'm getting on a plane Wednesday afternoon to go to CES.
I don't think the situation will be pretty: either lease takeover w/the stupid policy where the OP is still responsible or the OP will take a huge bath OR OP actually makes serious attempts to make the Leaf work for them, which may include possibly not leaving a lot of unused capacity on the table, preheating, driving slower, using Leaf Spy, etc.
More threads can be found by Googling and Binging for queries like these:
site:mynissanleaf.com early termination lease