I'm surprised there had been so little talk about it, but we all know that Apple is one of, if not THE biggest purchaser of Vega chips.
I don't know how many of the new Mac pros they intend to sell, but there is no doubt that Apple has a loyal fanbase wanting to upgrade from their trashcan pros.
More importantly, Apple demands their products "just work." I don't think Apple users really want to download monthly driver updates, not even the pros.
We know for now that current Vega STILL doesn't have all its features enabled, like primitive shaders. I don't think Apple would be happy with that.
So that makes me wonder... How much of the driver team is working to please their biggest customer, as opposed to gamers?