The New Traditional Trundle Splash Art doesn't reflect the champion model.
Here is what Traditional Trundle looks like in game: http://imgur.com/18gqm5p
Here is the new splash art: http://imgur.com/jA0MoqO
As you can see, the model contains areas on the face, arms, chest, back and legs where exposed muscle is visible, while in the new art, Trundle looks perfectly healthy and powerful. Without it being labeled as a Traditional Trundle splash art, there's no way to know it's a splash for that skin, because the two look nothing alike.
I think Riot should change the skin to more accurately reflect the character model and here's why.
1) Precedent. In the past, Riot has been willing to change splash art, or character models, so that expectations for the model and splash are equal. The most prominent example I can think of was back when Jinx was being released. Her character model's face was horrible, and Riot fixed it, because the model failed to meet the expectation the splash created. So, why change the splash instead of the character model? Well... 2) Target Audience. This skin is meant to represent Trundle as who he formerly was. It's a skin that only former Trundle users are supposed to have, and as such, we want him to be gross and missing flesh, and everything that visually prompted a rework on him originally. That's why the splash should change rather than the model changing. This new splash doesn't look bad, but it fails to meet the intended expectations the audience has for the skin. 3) Standards. The whole point of Riot updating the splash art on various champions is to not only unify the art quality of all champion splashes, but to ensure that the art lines up with the champion itself. Splash art is supposed to reflect the champion fantasy, and the skin itself. Creating a splash that fails to meet the fantasy, or reflect the model, is simply failing to meet Riots own standards for what a Splash Art should be.
I do like the new art, but when I first saw it I honestly thought Riot had decided to rework Trundle's lore so he was aztec themed rather than from the Freljord. This splash art looks nothing at all like the trundle I played in the ssotp days, and I really hope Riot respects the players this skin was intended for, and doesn't force this splash on us.