Well, I've had my Lumia since Tuesday and the battery is working pretty good for me.
Right now it's showing 1 day 20 hrs since last charge and I still have 56% left.
I'm no super user but it's Wi-Fi on/3G off when I'm at work and at home and 3G on/Wi-Fi off when I'm out and about. Location on. Lots of texts and emails, a few phone calls, some browsing, played a few songs, tested Nokia drive for a few minutes, at least 30 minutes of Fruit Ninja:blush:...
So I'd have to say I'm pretty happy about that, especially since I haven't received the update yet.
ps. forgot to mention I keep it in battery saver mode at night when I sleep...