Nintendo has confirmed that they will be announcing the Japanese price and release date on September 29th.
In the related news, Nintendo Europe has stated that the price of the 3DS will fit with the DSi for 130 pounds and the DSi XL for 160 pounds. From this we can assume that the 3DS will be around 200 pounds, which is bad for us, because that puts the DS at about around 300 US dollars.