Yeah, I did miss a couple of things...
You must have a Macintosh computer with
a PowerPC G3, G4, or G5 processor
a DVD drive
built-in FireWire
at least 128 MB of RAM
a built-in display or a display connected to an Apple-supplied video card supported by your computer
at least 2 GB of disk space available, or 3.5 GB if you install the developer tools If you see a message in the Installer that you do not have enough disk space to install Mac OS X, you can deselect items to save space.
USB doesn't need to be added to the list, because if you have built-in Firewire, you have built-in USB. Odds are that these requirements are not gonna change between now (WWDC) and the release.
Forgot to mention what makes me so sure... well, I know people who have seen the requirements and sent them to me. I am a developer who is very interested to know how long I can drag out my hardware before I stop being able to use the new OS releases on my Lombard.