Yeah, battery life goes without saying.
About the 64 bit processor, Jerry had an interesting point in the latest podcast. Maybe it doesn't matter for now, but what if the next version of android (by next I mean after L) introduces some features that are only compatible with 64-bit? Then this year's Nexus would become obsolete after only a year. That is something that slightly concerns me, given that i tend to keep my phones for 2+ years.