Depending on the slope of the hill and the spread you're traveling, this sounds normal for the CVT. I don't see the RPM fluctuate as much at highway speeds or slight inclines, but back hilly roads...normal.
Remember that with all the sensors and computers in there, the car actually knows you're going up hill. Depending on the hill and curves, it could just be the car running higher revs to give you a bit more boost up the hill. G and M sedans do this. They'll hold a lower gear a little longer (to higher revs) when you're going around a corner and up a hill. It's part of Infiniti's performance focus.
If you haven't tried the manual shift mode when going up or down hill, give it a try. You may notice a difference. I'm using it all the time and like the ability to control my speed, especially while going dow hill.
It should be normal. Now if it's constantly shifting up and down while you are going uphill it might be a problem. It should downshift when you go up the hill and shift back up when it feels like it has enough momentum.