I heard about this from one of my colleagues at the library. Terry Pratchett, author of the mega-popular Discworld series, has been diagnosed with a form of early onset Alzheimer's. This doesn't by any means suggest the end of his career, just a change to it. Having seen one relative go through Alzheimer's and now witnessing another go through dementia, I really feel for him, his family and his friends.
You can read a copy of Pratchett's official letter about this here. I'm amazed, and somewhat awed, that he's able to write this with his trademark touch of humor.