I've played it a bit - it's very nice. The neck profile is very different - almost like a compound radius fingerboard, since it's nice and round at the top and much more oval by the time the neck joins the body. It sounds really good, too - maple thru-block and mahogany wings will do that. The recessed tunomatic is a little strange to me, but it's the same height as a recessed Flyd, which makes sense. (All of my Floyded guitars have them on top.)
I think Dave's going to end up endorsing them. Me? Well, I found out recently that I'm actually still a Jackson endorser. That doesn't prevent me from buying a KXK, though, just endorsing them. I think Dave's got another guitar on the way...