Pretty sure it means Standard Disc or something like that, when ever I get standard versions of games it has "sd" written next to it on the gamestop receipt, if I get a special edition usially says "ce"Also, this list could change at any given day, Gamestop has about as much release info on games as the public, this is just a basic list, and there are games I know that arent on the list supposedly making their way this year.