I'm seeing many threads on this topic, and I have to add my voice to this matter.
I'm personally sick and tired of waiting for the official release of this firmware when it's been made available to your company by Microsoft since July. Furthermore, without 8.1 being released on VZW officially, users who have opted to not participate in the Developer Preview are being punished. There are ads running that promote Cortana, but that basic feature is NOT available until official Cyan updates are pushed.
So my big question: When are VZW customers going to get these updates? Silence on the matter is only going to fuel animosity.