I installed 4.2.2 yesterday and did several tests ( a custom CFX rom and kernels ), compatibilty with my most commonly used  apps and didn't really monitor battery usage. Gut feeling not much difference from 4.2.1 ( on Carbon v1.0 rom).
I reverted back to stock rom and stock kernel lastnight and I'd say battery life overnight is still pretty good . I went to bed at 99% battery life and after 8 hours the battery only dip 3 % . 3G was on always, and background FB notifications, email ( yahoo, GMail ) actively downloaded. Deep sleep recorded 96%

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partial and kernel wakelocks is insignifant

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