I believe this has to be stated: THERE HAS BEEN NO PRICE ANNOUNCEMENT FOR AMERICA OR EUROPE.
And let's see how Nintendo handled past hardware pricing.
The Wii launched in Japan at 25,000 Yen (~$216), it was released in USA at $250 along with a pack-game.
The original DS model launched at 15,000 Yen (~146), it was released in USA at $150.
The DS lite launched at 16,800 Yen (~$145), it was released in USA at $130.
The DSi launched at 18,900 Yen (~$193), it was released in USA at $170.
The DSi XL launched at 20,000 Yen (~$225), it was released in USA at $190.
I believe it can be can be assumed it will not retail for $300.