Interesting, and extremely positive. I've just finished my writeup on my findings in Lightroom on the nMP. One of the things I speculated about was the potential for programs to be written in such a way to allow for greater harnessing of the GPUs.
As others have said I very much hope this makes its way to LR.
If anyone is interested, here's the link to my article. It includes some benchmarks:
http://tony-hart.com/blog/essays/2014/01/mac-pro-a-lightroom-perspective/
Thanks, this looks like a great article... I'm saving it to read on the plane tomorrow!