Apparently this is the first time a novel has been simultaneously published in ordinary print along with a large-print version and a braille edition. I suspect this was done at the insistance of J.K.Roweling.

There was a quote in one of the papers from a ten year old boy saying how he was looking forward to being able to read it at the same time as his sighted friends this time, instead of waiting till his mother had finished reading it to him, which took a couple of months, and made life awkward, trying to avoid hearing what was going to happen.

And he was going to be able to read the braille version in bed in the dark, which was more than his sighted friends would be able to do.