Ok, I may have misread something, but I was going off of this[1], which was posted elsewhere. I could have sworn that a comment from one of the Wayland devs claimed that Nvidia, AMD, Valve were on-board (at least tentatively) with Wayland, but I can't find that post now.

[1] https://plus.google.com/100409717163242445476/posts/jDq6BAgd...