The Inquirer has some news about ATI's mobile R520 version. They claim ATI has implemented some mobile features directly in the desktop chip, reducing the time to make a mobile hybrid from the desktop chip. This includes a few power saving features that are directly integrated into the mobile core.
Delay of ATI's R520 chip gave mobile team some additional time to do the necessary modification and mobile version of the chip will be ready almost as soon as ATI launches its desktop version of the chip.
The mobile R520 will be made on the 90nm process and will have Shader Model 3.0 support.