The new Yorick is different enough to warrant a "Traditional" skin.
Riot in the past has said that the reason they moved away from making traditional skins is because they have been trying to incorporate the look of the old into the new. While yes his new look does reflect the same theme, kinda, as pre VU he looks different enough to deserve a traditional skin. He no longer has his awesome skull lantern hanging over him, the tattered cloths, multi colored ghouls, hunchback appearance, his mottled/bumpy green skin, or even his hammer/pick and bucket. Now he looks like generick pale blue shadow isle guy #3. I'm not saying i hate the new look, it actually looks really good, but it doesn't actually look like yorick. I feel like this is a drastic enough change to his appearance that he deserves a traditional skin.
Link to riots reasoning on not making traditional skins anymore:
looks nothing like his original self and he didn't get one.