Torchlight Concept Art Suggests... Something

Runic Games has updated the official Torchlight website with a cryptic message ("Things have been so busy lately, we have not been able to figure out what this is. any ideas?") that links us to a piece of concept art that looks very much like a piece to a bigger puzzle. Is this the first sign of an impending Torchlight MMO reveal? Or is it a complex marketing scheme with some kind of sinister motive? You decide.