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I was just looking on the Windows Phone website and noticed that there was an update to 8.1 and wondering why i did not have it on my phone yet.
After some more investigation i found this page
Basically the 820 on Vodafone is the only phone in the UK that has not got the update. Why?
Solved! Go to best answer.
I'm afraid that you aren't likely to get an answer to your query as Vodafone won't comment on when a Firmware update will be released. Also, as Nokia / Microsoft are responsible for the update, it may be worth asking them the question - they may be able to give you a bit more information.
Windows phone 8.1 or Lumina Cyan has not yet been officialy released, which is why you don't see the update,
Current release is scheduled for Q3, rumours are the end of next month
The website you are pointing to is refering to windows phone 8/Lumina Black
What you are seeing news about is the release of 8.1 preview for developers,
this is a programme by which registered developers can install an app to their phones and receive beta versions of updates
8.1 was released in this manner a month or so ago and has had 2 updates since (the latest a day or so ago)
Anyone can register as a developer and download the app which unlocks the ability to download these updates, but updating your phone to the dev preview may void the warentee