Nokia and Microsoft are slowly (but surely) looking to roll the GDR2 + Amber update out to consumers with a Lumia Windows Phone. Those with a Lumia 928 and who are anxious to get the update will be able to get dirty by manually applying it to their device. Windows Phone Central member tungha has published some links on the forum that contain files for the Nokia Amber update.
Fancy some flashing? You can now update your Lumia 928 manually, should you know what you're doing of course.