Yes. What I mean is that the power consumption is a little better, but the current generation Intel Celerons have quite low power consumption too.
One nice thing about x86-64 is that you can also run closed-source apps like games. For example, after having installed Crouton, I was able to install Steam and play some of the Linux games in my library.
Given the price and performance of current generation Chromebooks, I don't see much advantage in going for ARM systems right now.