According to a new support page dedicated to the Replacement program, some iPhone 6 Plus units that were sold between September of 2014 and January of 2015 could have a component that can fail and cause photos to look blurry.
iPhone 6 Plus units that are producing blurry photos and have an eligible ****** number will get their cameras replaced from Apple at ** charge. Replacement units can be obtained through Apple's online support team, an Apple retail store, or an Apple Authorized Service Provider.