I've been wondering too if it would be an improvement. I do agree that the battery life on this is better than the Gnex.
I'm at 61%, 10m 19mins, 1 hour 23sec on screen time, about 30mins on a call on the way to work. Coming from a Maxx, this is completely acceptable.
If i can get a little more with battery saver on without sacrificing performance, I'm in!