I loaded the update on the 2nd, and ever since I took my phone off the charger it has made a miraculous turn around, for the battery life at least. Just a few days ago my battery would go dead with in 8 hours with little use at all. This morning I took a screen shot just before work; 1 day 7 hours 68% remaining. This is with normal use also, Texting, some long like my feedback to AT&T. I browsed the net about 30 min, watched a couple vids on where to find terminals for Halo4. Made a few phone calls. The only apps I have installed are WPcentral, FB, I have a shortcut link on my home page to Waypiont and a speed test app everything elses has been deleated even all the apps that load from the factory. I was just amazed last night when I was using the phone but the battery was't really going down I'm still having rebooting issues and have noticed a 1% - 2% drop every reboot, so in the dozen or more reboots from yesterday that may have taken up a good portion of the battery itself.
Unfortunatly this phone is in the process of getting replaced because of the reboot issue, but I thought it was a strange coincidence.