The Inquirer is reporting that ATI's R350 is now being produced in mass quantities and manufacturers' cards should be available by April. Unless NVIDIA's FXs have some big room for improvement in the drivers side they will definitely have some hard time competing against ATI who are finally enjoying a more comfortable position with the new Radeons...
Many facts are already known. The R300 will be built on a 150 nanometer process. It is basically an overclocked R300 with eight rendering pipelines and two texture units per pipeline.