I eventually did import one and thought i would answer some of my own questions for the board.
1) Warranty- My understanding is as long as the car had been registered in the US for 6 months, this is not an issue
Have not been to a local dealer yet, so still need to confirm everything was transferred. Supposed to be fine though according to the Nissan US dealer.
2) Wings - Don't appear to work but not a major issue for me
There is an opensource replacement for car wings called the open vehicle montiroing system. The hardware is about $100 and you an get data sim cards for just a few dollars a month. They are in the process of adding Leaf support. Bought one and hope to be playing with it soon. The advantage is you are not tied to Nissan's server and the Tesla owners club offers the use of a server for free. More info athttp://openvehicles.com/
3) Metric guages - Apparently guages can be switched easily
Took about 2 minutes to figure out how to switch them over.
4) Approved List for Import (Transport Canada) - I believe it is permissible assuming the running lights get reprogrammed to on. Must this be done at the dealer or is just a fuse. What cost
Bought a really nice Philips kit with a smart relay that is supposed to figure out when the engine is on and turn on the lights. Also has a tap you hook up to a regular light which will then shut off the lights when the regular lights are on (Canadian requirement). Turns out whatever mechanism the smart relay uses to detect that the car is on (AC noise ?? ) doesn't work on an electric car. Anyway, was able to figure out something using a normal relay and directions on this form. Cost me about $100 and a full day of running around, but managed.
5) Maps - Is Canada included in the US version ?
They are there, but not very usefull. Absolutely no chargers availalble according to the maps (not true) and maps years out of date. Oh well, thank goodness for google maps.
6) Dealers - Do they typically know what paperwork is required. I assume I would need to pay cash No ?
The dealer I dealt with had not done it before, but was keen and did what was needed (recall clearance letter sent to RIV, title sent to US border). Biggest hangup was coordinating the shipping to a border location where I could drive it home from.
Found this blog that basically mirrored my experience. http://importingacarintocanada.blogspot.ca/
The RIV website also has some very usefull infromation.
All in all it went very smoothly and I'm the proud owner of a 2011 Nissan Leaf SV. The only hiccups were that the daytime running light mod was a litte more complex than I figured and I needed an extra mechanical inspection for Quebec ($90) above and beyond the RIV inspection. Also, Quebec taxes the import fees (doh).
Btw, so far we are loving the car.