It would certainly be good for their image if they supported blind users (apart from the existing text-to-speech function). However, a general interface to a B

It would certainly be good for their image if they supported blind users (apart from the existing text-to-speech function). However, a general interface to a Braille display is necessarily one which transmits the letters of the book in reading order, so I don't see how they can implement that without opening up a big gap in their DRM.