The NIS America store has put up all three previously announced editions of Disgaea 4: A Promise Unforgotten for preorder. All are available on PS3 only and will be released on September 6th. In addition, all copies of the game purchase from the NIS store will receive an exclusive bonus OST.
The standard edition of the game includes just the game and NIS-exclusive OST, and is $49.99. The premium edition adds a Fuka figurine and full-color artbook for a retail price of $59.99. Finally, the premium figure set includes all the content of the premium edition plus a full set of nine figurines, and will set you back $119.99.