Before we proceed, let me say that this model is NOT MINE. It was created by LEGO Group designers (EDIT: The designer was Christoffer Raundahl, one of the inventors of this building system whose BIONICLE design credits include the original Tahu and Kopaka sets), though it is most likely a MOC and not a set design (if it is an unannounced set design, though, you are free to celebrate at your leisure). The painted variant was detailed by Søren Westborg, a Danish artist who seems to specialize in painting tabletop gaming figurines, as a commission for LEGO Systems A/S.
Original model (photo taken by Flickr user Teabox at LEGO World in Copenhagen)
Gallery of Westborg's commissioned work (also includes a lovely painted Raw-Jaw)
I've built the leg and foot of the model on LDD (minus the heel piece, which is not available on LDD) and it's quite brilliant how they go together. I hope that some of these techniques wind up in sets eventually. These models have all the complexity of Witch Doctor and then some, and yet it comes together into a model that is far more refined and cohesive in design. Truly this model demonstrates that the Hero Factory building system is far from infeasible for "titan-sized" models. It just takes some very clever use of parts and a custom skeleton to create something every bit as incredible as many of BIONICLE's greatest titan models. And of course, as far as set design is concerned, a sufficient price point and age range for such a large, complex model.