The Nissan extension on the CVT Transmissions is only from '07 through '10 cars.
The newer ones are not getting the warranty extensions, according to the website.
The main things to keep in mind with the Nissan CVT transmission, and this is really, really important, so I'm going to put it in all caps below for extreme emphasis:
DO NOT HAVE ANYONE SERVICE THE TRANSMISSION EXCEPT A NISSAN SHOP.
Do not let Jiffy Lube sell you on a transmission flush.
Right on Nissan's website it says that the transmission flushes sold by most companies contains harsh cleaning chemicals that will damage the CVT transmission.
You must use the Nissan Spec transmission fluid, and so far there is only 1 company that claims they have a compatible fluid, but there isn't any point risking the transmission to save only a couple dollars difference than taking it to Nissan and having them use the right fluid from the start.
As long as you use the correct fluid, and change it every 30k to 50k miles, the transmissions have had few failures since '07. The biggest complaints were related to bearing noises, but no actual failures. Nissan had just been removing the transmissions and slipping new ones in whenever someone complained to their service manager about the bearing noise.
They appear to be quite robust and strong transmissions, as long as you don't let someone put in the wrong fluid, or try and perform a trans flush service.