Well your question has been answered with the Update Central app.
Download here: Update Central | Windows Phone Apps+Games Store (United States)
When you have Windows for Devs installed it can sometimes cause your Extras+Info app to appear to say Cyan but its a bug in the app that tells you that your running old firmware but in fact you do have Denim.
This app also tells you when future OS releases and firmware releases are due out and their respective names ie cyan, denim etc.
Very good app. Worth the download.
Sent using my Tapatalk app using my Nokia Lumia 520
Download here: Update Central | Windows Phone Apps+Games Store (United States)
When you have Windows for Devs installed it can sometimes cause your Extras+Info app to appear to say Cyan but its a bug in the app that tells you that your running old firmware but in fact you do have Denim.
This app also tells you when future OS releases and firmware releases are due out and their respective names ie cyan, denim etc.
Very good app. Worth the download.
Sent using my Tapatalk app using my Nokia Lumia 520