Yes, even though this occurs on a regular occasion, we are to be shocked that another secret backdoor into a security product has been discovered, exploited and published.  In this case it is Microsoft's Secure Boot which has been unlocked and even better news is that it probably cannot be completely repaired without rendering previous backups and installations incompatible.  On the positive side, devices which are locked down even for those with administrative privileges such as ARM-based Windows RT tablets can be unlocked and you can chose a different OS to install.  The negatives will have more of an effect on businesses and system builders who relied on it to prevent modified Windows installs from booting, preventing infections and questionably sourced Windows images from being used. 

The Register has links to more information on Secure Boot and Microsoft's response and you can read some information about the group which found and released the information about this over at The Inquirer.

"Microsoft leaked the golden keys that unlock Windows-powered tablets, phones and other devices sealed by Secure Boot – and is now scrambling to undo the blunder."

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