Well, I really got disappointed, after seeing the battery life of the "refreshed" 11" & 13" MBAs (switching to Broadwell from Haswell). Both generations have the same screen, practically the same logic board (Broadwell is pin-to-pin compatible with Haswell...) plus other hardware and the
same battery ratings.
Earlier (either in this thread or somewhere else in MacRumors Forums) the member nicked "mortek" had made out a very logical estimation for the Broadwell refresh and had arrived to the conclusion it may be minimum 13 hrs. (if not a bit more) for the 13" MBA refresh. Well, there are all reasons to believe this estimation, but Apple is still indicating/announcing 12 hrs.!...
What the heck?