No, it's not. It's honestly not that big of an implementation to track a battery's health. It just needs to check current capacity vs design capacity as well as various other variables (depending on how the iOS developers choose to go about implementing it) to determine as to whether or not the battery is in good health or not, and just display the information in iOS settings, probably in the Battery page or wherever they decide to put the information. Not that difficult to do, and I don't think it would require too much testing to warrant a delayed beta 1 without it and just put it in a beta 2 or later.