We have already told you about the first member of the ATI's, sorry AMD's, Northern Islands family taping out, it is called Barts. Barts is a mid-range part aimed squarely at the Nvidia GF104/GTX460 chip, likely called the HD6770. It is due out really soon and should obliterate the competition.
http://www.semiaccurate.com/2010/09/24/amds-6870-coming-november/
http://www.semiaccurate.com/2010/09/24/amds-6870-coming-november/