I was reading at the Brickipedia site about upcoming 2013 LEGO sets and found several in a list which were referred to as "DTC", as in "40055 DTC Seasonal Halloween 2013" found here. What does the DTC stand for?
I believe that in this context DTC means direct to consumer. These sets are typically only available directly from TLG either via online orders from LEGO S@H or from LEGO retail stores.
Here's the original source and discussion for the DTC set that you mentioned and several others: