Seems there's nothing specific in the article about which which changes to DX are supposed to enable CGI quality, or how. Is it more polys/sec for smoother models and more geometry? Maybe a more efficient shared memory architecture for GI (I'm speculating. Maybe dreaming)? We're always being promised cinema quality in games, and while we're really not all that far off from it already, we're still quite a bit behind in lighting/rendering.
And not just rendering. Animation is the biggest issue. You don't get Hollywood quality animation out of nothing. DX12 is going to provide some new features but calling it "as good as CGI" (i.e. movie-quality CGI) is just dreaming.
Perhaps it's just the increase in performance because DirectX is going to support multicore CPUs? The article only mentioned a doubling in performance. Isn't most of the work done on the GPU anyway?