Just saw this, nice change if people want to get AC+ On their iPhone later on. Does not extend it on iPad, watch or iPod. The change is retroactive, so if you bought the iPhone less than a year ago you can now buy AC+ for it.
http://www.phonedog.com/2017/03/17/apple-extends-applecare-eligibility-new-iphones-one-year
http://www.phonedog.com/2017/03/17/apple-extends-applecare-eligibility-new-iphones-one-year