I regret to inform you that they just announced it on the official Facebook page and it says:
"
Specially created for our North American KINGDOM HEARTS players, today we're excited to announce the Mark of Mastery Edition for KINGDOM HEARTS 3D [Dream Drop Distance]!
This limited premium box comes with the game, a set of 5 AR cards that unlock rare Dream Eaters, a set of 12 art cards reflecting the history of the series, and a special Nintendo 3DS Protector Case. All of this great content comes contained in a special magnetic case emblazoned with beautiful argyle KINGDOM HEARTS print.
It normally takes years of dedicated training to earn the Mark of Mastery, but this collection can be yours on July 31! Oh, and did we mention that this is a limited offer?"
Once again, this fails to mention anything about it being for Kingdom Hearts 10th anniversary, which leads me to believe there may be something else in the works. I expect something to come out for Europe, but perhaps since Europe got the BbS CE, they feel NA should get the CE this time around (completely ignoring the fact that Europe didn't get Re:CoM -__-)
EDIT: It also said "go preorder at your favorite retailer today" which leads me to say that yes, it will be available at Gamestop and many other retailers.
Kingdom Hearts Facebook Page
Here is a nice photo of the front of the box: