[Jelly Bean 4.2.2] Can anyone comment on Battery efficiency and Black Screen on GNex?

One day after Jelly Bean 4.2.2 started rolling out, the product page for Nexus 7 had been updated and the 'estimated battery life' was updated from (was) 8 hours to (now) 10 hours. In light of this, I was wondering if anyone noticed any battery life improvements on any of their Nexus devices (or at least the N7)?

Also, because this affects me, has anyone been able to confirm if the BSoD (Black Screen of Death) on the Galaxy Nexus, which happens when Auto-Brightness is ON, has been fixed?

Many Thanks.

(Note: I'm yet to receive the OTA on my Yakju GNex)