Microsoft is known for championing inclusion and accessibility causes, bringing gaming and other Microsoft services to those who have various types of accessibility needs. Recently, leakster h0x0d discovered promo images for an unannounced Xbox controller, which we've heard is designed around accessibility needs. It will likely get its big reveal sometime between now and E3 2018.
While we don't have many details about how it works exactly, you can see in the image how it has grooved impressions at the top which represent all of the Xbox controller's different functions, which would help users who favor touch over sight to program different buttons, and two large "A" and "B" buttons which are presumably programmable. It also features a 3 light LED similar to the previously leaked Xbox Elite V2 controller, which could be to indicate when different programmed modes are active. It also looks as though it has a USB port and 3.5mm audio jack on the left side.
Expect more details in the near future, but this is just another example in a huge list of commitments Microsoft and the Xbox team has been making to help those with unique accessibility needs.