I've also heard some serious questions as to the ethics of publishing it at all, whether Lee was in any state to give approval anymore by that time.

I have not. Honestly, I've read very, very little science fiction, whether classic or more recent... Childhood's End, Solaris, Left Hand of Darkness and part of The Dispossessed, The Sparrow, Consider Phlebas, Memory Called Empire and its sequel, Gideon the Ninth and I think that's just about it.