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#1
The article doesn't point to any premade usb key but explains that MS will provide instructions for something already very familiar to people here on how to go about creating a usb key with the download of 7 for installation purposes. Instead of this being the betas or RCs those who have the finished retail version of 7 being subscribers at MSDN and TechNet have already beeing using this method.
The usb key method would be the only actual method for any upgrade or clean on a netbook since you don't have any optical drive to work with only usb input. The thing to pay the closest attention to in the article there is...
Microsoft officials confirmed to News.com that it will make available an online tool, starting on October 22, “that will walk users through the process of moving a downloaded copy of Windows 7 onto a USB drive, be that a memory stick or portable hard drive.”