I wouldn't worry too much.
I owned an Altima with the same 2.5L engine/CVT combo. By the time 2011 rolled around, Nissan had worked out most of the bugs and kinks with their CVT's, at least with regards to the units attached to 4-cylinder motors. They were still having problems around that time with CVT's mounted up to their more powerful V6 engines, like those in the Murano and Pathfinder.
I don't think you need to worry much if at all. If you're really, really worried about it, and how the Rogue may have been treated by its past owner(s), you can take it to a Nissan dealership and pay them the $300-$400 to change out the CVT fluid (although that's not necessarily something I would worry about until about 100 000kms).