Source : https://www.windowscentral.com/microsoft-patents-xbox-braille-controller-visually-impaired-gamers
The Braille panel in the back seems to constantly adjust itself, so that gamers who are blind or have other visual impairments can read the text through the back of the controller. That's not all though, the patent says that the controller will also be able to convert speech to Braille, allowing users to communicate in chat or when they're livestreaming.