I can't provide scientific evidence of battery life as many can on this forum but I will say that, so far, the battery life has been outstanding.
I received the phone at 1155 AM yesterday. Activated, and only kept it hooked up to my computer for a minimal time. I intend to run the battery completely down, and then fully charge.
I have been using it almost nonstop...Trying out apps, creating folders, moving things around...
So, I never really charged it up beyond the charge it came with, and it's still at around 50 percent...