Amazon Presells 75004 Z-95 Headhunter

Amazon has finally posted a listing for 75004 Z-95 Headhunter. Asking price is $49.99 and will be released on December 31 just like all the other 2013 sets. Still no sign of the MHC yet, which I’m dying to get my hands on.

Also, if you haven’t bought/ordered 75005 Rancor Pit, Amazon has it on a slight discount at $56.95, 6% off.

Is it presells or pre-sells? I can never tell. Same with pre-orders and preorders. Which is the correct way?