Having trouble finding the ATI RV370 driver. is it on another site? I did find another site with it listed, but all they want you to do is install their programs and don't let you download the drivers.
The software itself is not bogus - it is designed to help you find drivers for Windows 7, Windows Vista, and Windows XP, which are not in beta testing. You landed on a page that is trying to help you find drivers for those systems. The bottom line is that if the latest drivers at AMD Support & Drivers do not work for this device under the Consumer Preview version, you will have to wait to see if newer unified AMD drivers that come out will support Windows 8 for your graphics card. Right now, you really cannot expect any driver support when the OS itself is in beta testing.
You are in an unfortunate position whereas this line of graphics card was actually designed in 2002. This is about one year after Windows XP became commercially available and before the current Windows Display Driver Model (WDDM vs. XPDM) for Windows Aero was even around. See this article for full understanding: XPDM vs. WDDM
You really may need to wait, as even more modern graphics cards using fully compatible drivers may run into a snag. I hope this explanation gives you some help.