Famitsu Weekly already that Square Enix to announce the release date for Kingdom Hearts: would not wait long Dream Drop Distance. You are their promises become more than just, today announced that the game on 29 March 2012 for ¥ 6090 (≈ 62 €) in Japan will hike over the counter.
Not only that, but still know that you can buy four different versions of the game:

the standard version (6090 ¥-version)
The Limited Edition (which contains the game nor an AR card)
The Limited Edition Bundle (includes in addition to the game and the AR-card or a special design in 3DS) and
the KINGDOM HEARTS 10th Anniversary Box (details unknown)"What's the point if you please for an AR-map" asks ye surely now. Well, this card is included as an extra in the Limited Edition and allows you to gain access to a rare game in the Dream Eaters, who would unlock the normal way very difficult.
Gives the Dream Drop Distance 3DS version is only bundled with the game.
In Japan you can buy the game but also together with the console in a bundle. In this bundle has the Nintendo 3DS, a special design to match the game. Certainly there will therefore be quite a few Kingdom Hearts fans who wait until the release date by purchasing the console. Whether there will be these additional versions but also here in Europe is still unclear.
The e-Store of Square Enix also lists another acquirable Edition: 10th Anniversary Box, the KINGDOM HEARTS. Obviously this could be to the order announced by Nomura Special 10th Birthday Birthday of Kingdom Hearts act. The website reveals, however, still not know what it is this Specialbox.
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