The entire approach DSC has taken up to this point suggests they won't go for the TOS look, unless it's heavily modified or has already been heavily modified. Even the D7. When I saw the holo-projection in this episode: my first thought was the opening scene in TMP (because regardless of what anyone thinks of the movie, how can you forget that scene?), not anything from TOS.
The movie D7 is, to my mind, the perfect example of "that's how it always looked." The silhouette is essentially the same, but with more details. I wish Discovery had treated the TOS Enterprise design with the same respect.