From the announcement:
Cambridge University Press has entered into a license agreement with Bookshare, the California-based nonprofit organization that provides books in accessible formats for people with qualified print disabilities such as blindness or low vision, a physical disability or a severe learning disability that affects reading.
Under the terms of the digital rights license agreement, Cambridge will deliver academic and scholarly books from all of its regional publishing centers around the world to Bookshare for conversion into accessible formats. Individuals with qualified print disabilities around the world will be able to download the books for a nominal Bookshare membership fee and read them using a computer or other assistive technology, with voice generated by text-to-speech technology, as well as options for digital Braille. Qualified students in the U.S. will have free access to the books, thanks to a special award from the U.S. Department of Education, Office of Special Education Programs.
Incase you're interested, here is a list of participating publishers.