Farenheit 451, anyone?
I think this is absolute bullshit. Censorship is wrong. If you don't like, or are offended by the work, then don't read it. The only time I see words as being bad, are when they are being used to teach people how to be cruel to other people. At the same time this is marketing genius for the person who plans to release this book.
As for copyrights, any works prior to 1978, still in their original or renewal term of copyright, the copyright was extended to 95 years from the date that the copyright was originally secured. Since the original copyright on Huckleberry Finn was 1884, and it's author has now long been deceased, the copyright on the text has expired, and the book can be found just about anywhere on the net, and the original text now has passed into public domain. There can be special circumstances of course where the content may be an individual edition that is still be protected. For example- prefaces, forwards, afterwords,footnotes, annotations, and sometimes even cover art.
I should publish a version called Fuck Hinn, and see if anyone is offended by that.