For the moment, this is just a heads-up. As I said previously, I think that Harris is approximately right, but I don't think he has successfully defended himself against the criticisms that have been made of his fundamental metaethics (e.g. his reply to my point about psychopaths or unsympathetic, but rational, alien monsters misses the point). Still, see for yourself.
There's a note of exasperation in the whole piece. Understandable, I suppose, but most of the people he's replying to are his allies on more general issues, and are attempting to engage in courteous and rational discussion. We simply have our own views about the relationships among metaethics, normative ethics, empirical inquiry, and so on. Some of us may even fondly imagine that it would help him refine and strengthen his position if he accepted the force of some of our points. We're basically on his side.
In my case, it's a well-developed view. I don't have a book coming out about it, but I've sketched aspects of it in refereed journal articles. The book is a project for another year.
I'll return to this in more detail over the next few days.