The site says the RV670 is made by TSMC on a 55nm process and will consume about 50% less power than the current high-end cards (240W for the R600).
There are two flavors:
RV670 XT: 825MHz, 1.2GHz GDDR4 memory, 132W TDP RV670 Pro: 750MHz, 900MHz GDDR3 memory, 104W TDP