Joe Belfiore has now confirmed what we have been saying all along. No need to roll back if you are running developers preview version of Windows Phone and you should get the device firmware ( Read Lumia Cyan ) when it becomes available.
In fact, we have many of our users telling us that they received Lumia Cyan when they were already running Windows Phone 8.1 developers preview.
That’s why we suggested to wait, when everyone and their mother wanted you to roll-back to Windows Phone 8. I hope you may be now rocking Windows Phone 8.1 GDR1 on our devices already.