I always find it hard to understand what's the hype with 64bit on mobile. What does it bring to the table? Longer words? Sure... but what for? It's not like it'll make it easier to port from x86_64 or anything. More memory? Seriously? You'll run into IO issues before you hit performance issues because of lack of RAM. "Faster"? Same as before.

Somebody enlighten me please, otherwise I'd like to see efforts spent in energy efficiency, better batteries. Samsung would be doing well spending more effort in serving their customers right as well. Lots of other things to do before going 64bit in mobile...