Well let's see what we have here.
Verizon gave up releasing the global updated why? Because the rezound is too old to bother with jelly beans, global update, or anything else.
But the rezound uses LTE, and will continue to be used for a few more years. So this update has something to do with a LTE change.
This update is so important that it gets forced onto the phones without giving the phone owners a choice.
This update has something so unpopular, that Verizon is unwilling to reveal what it does, and instead lies to us.
My best guess is a LTE slowdown rationing system targeting people with unlimited data. The more you use, the slower it will work.
This is my guess, and I am sticking to it.