I'm not sure if it's just the way the Dev Preview worked by doing you're on cyan, but I still haven't received the 8.1 update and my phone settings show cyan. I'm on metro in NYC, anyone else around me gotten the update?
^ That's entirely false.
My mother has a Lumia 521 and my sister enrolled her phone to the developer preview to update it to windows phone 8.1
I just updated her phone a few mins ago since she said her phone was making funny noises. I did so and it updated to Lumia Denim
Here is a screenshot
View attachment 87261