In the story about the difference between a DP phone and a Developer phone, it was stated that the 920 (non-DP) is getting Cyan /8.1. I see no mention of this anywhere else.
It says that the 920 developer model is getting the update. This is only if you are a developer who was sent the phone directly by Microsoft/nokia or if you got a device from a build conference etc. Normal 920 or developer preview 920 is not getting it just yet.