Bloomberg of Japan are reporting that Nintendo plan to announce pricing and release details of the upcoming Nintendo 3DS on September 29th. No further details are mentioned in the report, other than that the device is still coming this fiscal year.
Nintendo are in the habit of holding a press event some time toward the end of the calender year in Japan. At times, accompanying events are held in North America within a day or so of the Japanese event, usually with access to the company’s upcoming line-up of games. There’s a chance the 3DS announcement could be part of a similar event in Japan.