It is for those of us with portables, a number of us have lost a great deal of battery life and Apple has contacted many of us about it back in August. The 10.8.2 update did little to nothing and we can only hope that the next update will help.
I was one of those. New 11" MBA m2011 bought last Dec went from 5 hrs to 2.5 to 1 as I installed 10.8.0, .1 and .2 respectively. After 10.8.2 it has also displayed a persistent replace battery flag message...
Apple called me when I complained in the Apple forums after .0, sent diag software, and followed-up after.1, but failed to return my several emails back to the contact after .2 ...
If, after .3, the situation does not improve, I'll have them replace the battery (which I think was damaged by the excessive heat generation problem after the .0 install) under warranty.
I bought my mom a 13" m2011 MBA and she has similar unresolved problems too.