Don't think its Exclusivity.
I reckon there just breaking the street date for some reason.
No. Gamestop doesn't break street date on this kind of scale. They're the most strict on street dates and if it does happen, it's a few stores. Either it doesn't have a street date (many games actually don't) or it's 1 week exclusivity, and I'm banking on the latter since it seems other retailers aren't offering it.