Seems the 300 designation has been dropped. Release date is mid march. I expect pricing will be about $50 over comparable ATI hardware at first but that's just a guess based upon simple common sense is that too large of a price difference won't sell.
Depends on how it performs, and since we don't have a very good feel on that yet, it is hard to say. Also depends heavily on how much stock they can build up. If they run into shortages like the 5800s did, we'll be seeing retailers raise prices over the NVidia recommended price.