Looks like Square Enix dropped a release date deuce. Kingdom Hearts 3D (also known as Kingdom Hearts: Dream Drop Distance) will be coming to Europe this summer; Of that, there is no doubt. But according to GimmeeGimmeeGames, the date they're aiming for may be July 27, 2012. The site claims a entry for the game on Square Enix's official French site briefly listed the release date as such, before it was hastily replaced with a vague "Summer 2012".
Japan's release is firmly set at March 29, 2012. If the French listing was at all accurate, it provides some small hope that localization for the North America version will have an equally quick turn around, perhaps allowing for a early fall (instead of holiday season) release. One can only dream...or perhaps wish upon a star?