I used to be given children's versions of adult books at Christmas in my youth... I remember a 'cadet version' of Reach for the Sky; goodness knows what was left out of that.
So this is nothing new. Especially not with Huckleberry Finn, which has been controversial for years, though Mark Twain was firmly anti-racist at a time when most people weren't. But the N word is still offensive to many, and the publishers will want to get them reading the book too. As jake says, the book isn't being banned, they're just doing a schools version.