I think trundle is a pretty good champ the way he is. Whne played right he can be really OP. Idk about gicing him a better looking skin though. That would not fit with his story. After reading his story i just wanted to learn how to play him.
Talking about quality, not necessarily making him completely different.
They stated that he would keep most of his look, club included, but that he'll still be different.
He indeed has an interesting lore, they did say they wanted to change him keeping this in mind, so it shouldn't be too far.
I have never had the chance to see a good player play Trundle so I have no idea of his true potential. I did play him a bit but in solo queue it was hard to make his *** useful, even if I timed them around my team mates actions :/