Nvidia cards, got no clue. Pretty much nothing is known about them.
The Radeon cards, from some leaked specs that look legit (but not confirmed) has the 8800 series cards MSRP price. So AMD is recommending those prices, though its not a guarantee of that price. I would assume the rest of the 8000 series would follow the same trend. My personal guess has the HD8970 releasing at ~$430-450 depending on how fast the board partners can start making their own designs. I'm guessing since it was delayed we will see custom cards on release.