There is something pretty clearly wrong with your train of thought, here.
The Developer Macs that Think Secret reports on are, yes, capable of running Windows. Apple has said, repeatedly, that they won't stop anyone from running Windows on the new x86-based Apple machines.
The Intel Macintosh Computers will be, however, running Mac OS X.
You can install Windows XP on the machine if you want to, but that does not mean that it will be installed by default.
Furthermore, having a Windows installation does not mean you are susceptible to Windows viruses by itself. What makes you vulnerable is running the Windows installation (In other words, running Windows, which you can do on an Intel Mac, but no one will be forcing you to), which means booting into Windows. You know. Windows.
I have to say it yet again: OS X, no matter what hardware it runs on, is not Windows. It just isn't.
Windows is Windows. if you run Windows, you may get Windows viruses. If you run OSX, you will not get Windows viruses.
If you have an Intel Mac and run OSX, you will not get Windows viruses.
If you have an Intel Mac and run Windows, you may get Windows viruses if you're not smart.
If you have an Intel Mac and have a Windows installation and an OSX installation, but only run the OSX installation, you will not get Windows viruses because you are not running Windows.
Your Intel Mac will be capable of running Windows. That does not mean that it does. It doesn't even mean that it necessarly will. The choice to run Windows on an Intel Mac is up to the user.
And if you get Windows viruses running Windows on an Intel Mac, you are not getting Windows viruses on OSX. Because you are not running OSX. You are running Windows.
If I can make this any more clear, please let me know how.