Adobe Camera Raw Supports Nikon D850
See my Nikon wish list and get Nikon D850 at B&H Photo.
Hooray! When I do get a Nikon D850, raw support should not be an issue, barring a bug (there have been issues before, such as with the Hasselblad X1D, which was fixed a few months ago).
As of September 6 2017, Adobe Camera Raw 9.12.1.790 supports the Nikon D850.
Adobe Photoshop Lightroom has NOT yet been updated as of 2017-09-09, but since Photoshop and Lightroom share the same core library, I expect it soon.
For Photoshop CC 2017, use
to update the Photoshop ACR plugin.