Well, I figured out how to fix this, and I thought I'd post it in case somebody else is having this problem.
After a fresh install, I didn't bother trying to install the proprietary drivers just yet. Instead I went to System->Administration->Update Manager. Then I hit "check," knowing full well that there would be NO updates, since this was just released two days ago. (Of course, hitting "check" has to be done with a current internet connection, which means if your wifi card isn't detected yet then you have to do it through hardwire).
For some reason, this tells Ubuntu what drivers you need. After doing this, even though I didn't actually update anything, it then correctly identified my video card and wifi card. I confirmed this on a computer of a friend of mine, who had the same problem.
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