It seems 4.2.2 updates has some media server fixes
Going through the change log posted on android police. I noticed this part. I am not really able to make sense of the commit but it seems to contain some fix for the mediaserver service (which has been a cause of many battery user reported battery drain problems) guess we have to keep our fingers crossed.
Author: Eric Laurent <firstname.lastname@example.org>
Date: Fri Nov 2 16:48:26 2012 -0700
audio service fix dock after crash - DO NOT MERGE
merge from master:
"audio service: set dock use on mediaserver restart
Restore forced usage of dock audio for media according to
current setting when media server restarts."
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