Thank you to Ovind for finding this:
http://www.ishootshows.com/2016/01/05/shooting-impressions-on-assignment-with-the-nikon-d500-and-sb-5000/
Todd Owyoung has shot Nikon for years, so not everyone might view him as having an unbiased view. However this report is based on real-world usage last Autumn.
There are several images posted, sadly I couldn't find any details of ISO settings etc.
A couple of quotes caught my eye:
"how does the new 153-point system work in the real world?
Shooting with the Nikon D500, when ambient light conditions called for ISO 12800 and above, the AF of the D500 crushed it, even with moving, low contrast subjects in dim lighting (AKA live music photography). When I photograph musicians, they are almost in constant motion — rocking back and forth, moving up to a mic stand to sing and then shifting back to shred — and this kind of action often happens in very low lighting.
A typical show might require an exposure of ISO 6400 at f/2.8 and 1/500, and in this type of lighting, AF has to perform or you go home without the shot. The Nikon D500’s AF nailed these kinds of challenges with ease.
I shoot almost exclusively in AF-C, and
I found that the D500 new AF module and algorithms are as good as anything I’ve ever used and better. Nikon’s AF has always been excellent and one of the reasons I have always used Nikon DSLRs, and the D500 only improves on this legacy."
and
"In particular,
the new 153-point AF system is class-leading, and I think that this, combined with the 10 FPS continuous shooting rate, are going to be game changers for any photographers who chase decisive moments."