if i upgrade from the haswell i5 to the i7 how much of an impact on battery life do you think it will take.
Maybe not, but the difference would be negligible. Same TDP.
I've ordered the i7 and thinking on changing the order, I've seen tests of 2012 MBA with i5 and i7 and the i7 was much hotter, faster fan rpm speeds and less battery life than the i5, I wonder if the new Haswell processor is any different than the 2012 model.
anandtech.com only showed a 15-25 min battery life difference at most for the 2012 MBA i5 vs i7.
I fail to see how upgrading to the i7 would increase hotness. Surely, if there was any, it'd be under load that surpasses the i5 performance threshold?
You are assuming your usage patterns match the testing that was done. A very bad assumption.
Thanks, do you have any links to review and tests website with the new MBA?
There's this excellent article by Michael Olivero that I liked very much, comparing the 2012 i5 vs. i7, focusing on battery life and heat output: