Gamestop as a company uses placeholder dates for anticipated games until an actual release date is confirmed.

Lots of games that are a year or more down the line will have a date like the 1st or the 31st because they just want a sku in the system that let's people reserve, which can't be done if it doesn't have a release date...

For the longest time Diablo 3's release date in their system was listed as 1/1/12.