My 20 month old (i.e. out of warranty and with no Applecare policy) iphone 6+ started showing the symptoms a week and a half ago. The "Genius" at the Apple Store immediately recognised the symptoms and processed a free replacement (refurbished) phone without any prompting or negotiation on my part.
So while it's true that they are staying very quiet about it in public, it does seem that knowledge of the problem and a free replacement policy has been communicated within the company.