adrynalyne tweeted about 3 hours ago that the OTA has been pulled and from everything I can see he is right. The original Page with the update changes has been pulled and now has the old FROYO update in its place. http://support.verizonwireless.com/pdf/system_update/thunderbolt.pdf
I've also tried to pull the update this morning and it's not there anymore. Others are also reporting that they can't get it now.