I originally saw the link on Digg, and it simply links to the Apple Discussion forums, which as we all know, is the MOST reliable source of official Apple information. As of right now, no official Apple employee has posted any information on this, so all we have to go by is quotes of people talking to Apple store employees and talking to phone tech support.
Here's the link:
And here's a quote that kinda killed the arguement:
"OK, so all this got me a little worried so I called AppleCare and asked. I asked "if I install Boot Camp will it void my warranty since it is Beta software." He said "Hmmm, that is a good question, I do not know let me check..." I thought Oh Crap! He came back on the phone and said "No, it does not. " So I asked one more time for clarification. I asked "So if I install Boot Camp it will not void my warranty correct?" He said, "That is correct, it will not.""
Also, when you install Boot Camp, Apple tells you in the Terms of Service that you must agree to that:
HOULD THE APPLE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE ENTIRE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
But that doesn't cover hardware, just the fact that if your files are gone as a result of this, you're not getting any help from Apple.
So as I understand it right now, it doesn't void your warranty.