According to an Italian PlayStation magazine PSMania, Dark Cloud 3 will be released exclusively on the PS3 in 2009.
Level 5, who are working on White Knight Chronicles due later this year, are also currently working on Dark Cloud 3.
The translated article states:
One of our infiltrates, has revealed that Level 5 is working on a new Dark Cloud exclusively for the PlayStation 3.
This title will come out in March of 2009, and will be developed using a new open-technology, the Japanese style "Kumo Engine".
For now this is being dubbed a rumor, but time will tell for sure.
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