Looking through Gaspez-Art web-store, I found two models of Chaos Dwarfs Bullcentaurs.
They are definitely much better than those ancient models (see below) from GW were, but I'm still not fully satisfied with them.
The problem is that they are too much in the style of old Ch. D. models. I have no idea, how will be Forge World models for this army in the future, but I can bet that design will be definitely modern. If you want look to the Scibor Miniatures' Moscals project.