It is hard to defend against this. Once you start you can never stop. And not responding to a lie, will make it the truth in the media. Better to not comment. Just run the company well and make great products.
I can't remember an OS update or an iPhone update in which battery was not an issue.
My battery life is better with iOS 6.1 and better than I got with the 4. Only difference might be that I do not leave LTE on- I use when speed is really needed.