I've been testing this, and battery life seems a little better. That being said, in my experience is about the same with WP 8.0 or WP 8.1 (after a hard reset). Overall a little disappointing, I find myself recharging in the middle of the afternoon. I have no hopes for cyan firmware regarding improvements on battery life. I will continue to support Windows phone hardware&software for many other reasons and mainly because I like it!!! Hopefully in the near future the hardware will be on par with the market, till then I think "we" (Lumia 925 users) will have to accept that battery life is just not good.
Sorry for the long post but I needed to let out my frustration! &*&%%