Here's a question. If, in fact, VZW has found a bug in the 2.1 version set for OTA distribution, what makes anyone think the same bug is not present in the various "leaked" version of the update?
It may of course be a bug introduced by Verizon's modification of the updated code but if that's the case, why is it assumed that such modification isn't needed for phones running on the Verizon network?
It's very likely that whatever problem has been discovered at this late date affects only a tiny percentage of phones out there. But when you're distributing an operating system to hundreds of thousands of phones even a tiny slice of that market is important and problems can result in thousands of unhappy customers.