From majornelson.com:
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So, for those who got in and happen to have a 'home-made' Xbox360 HDD ... let us know in the forum thread below if your storage device got locked out or not. Also mention if you used a HDDSS.BIN you got from the internet or one of your own or with modified serial.
Wave 1 of the Xbox LIVE Update Preview Program is in the process of being pushed out to those selected. If you were not selected, don't worry...we'll be adding more people over the next few days. If you have been selected, you'll will get the update sometime over the next few hours when you sign in to Xbox LIVE. You can confirm your acceptance in the first wave by signing in to the Connect Site, where you'll also find more details on the program and links to the private preview forums on Xbox.com. In addition, we've also be sending you an an email to your Windows LIVE ID that you registered with Connect.