Nokia has announced how it is rolling out Amber. It will go first Lumia 920, Lumia 820, Lumia 720, Lumia 620, and Lumia 520 and their variants in what the company calls a phased manner. You can perform a manual check by going to ‘Settings’ -> ‘Phone Update’.
Nokia says you may find ‘coming soon’ or ‘waiting for approval’. When the software update is ‘waiting for approval’, it is still being processed in the final testing. ‘Coming soon’ says Nokia. Means it has already approved the software and are ‘doing the final tweaks before releasing it.’
Why doesn’t everyone get the update at once? Nokia’s answer is that to ensure the update ‘meets our quality standards, we’re running multiple tests with various country variants and operators. We make the updates available to you as soon as we complete testing. With Lumia Amber we expect to have the update arriving in all Lumia Windows Phone 8 phones by the end of September.’
So now you know.