“With OS X Mountain Lion being released only via the Mac App Store, the free upgrade is being delivered a redemption code for the store,” Slivka reports. “While the company has yet to officially announce it and almost certainly will not do so until OS X Mountain Lion itself actually launches, the company’s Up-to-Date online application form is already live.”
Slivka reports, “Users are required to enter their date and location of purchase for the qualifying Mac, fill out personal contact information, and enter the serial numbers of machines eligible for the free upgrade to OS X Mountain Lion. Once all information has been submitted, Apple generates a reference number for the claim and the actual redemption code is delivered via email. “
Read more in the full article here.
[UPDATE: 4:15pm EDT: After a brief time online, Apple appears to have taken down the form to request a copy of Mountain Lion. It's likely to return following Mountain Lion’s official release.]