According to FUD Zilla the ATI R700 GPU is still scheduled for 2008:
We previously misjudged the speed of introduction and the R700-series is likely to launch in the second half of 2008 rather than later. The base R700 model, a chip codenamed RV770 is already taped out, but ATI doesn’t want to rush things.
At this time there is no indications that the RV770 chip will be pushed to 2009. Nvidia’s counterpart to the R700 is also scheduled for the second part of 2008 and we heavily suspect Q3 or early Q4 introduction for both.