Tony, despite I dont see a diect answer to your question I can tell yo som,ething: I have been looking for the Black update yesterday my mobil is s Nokia Lumia 520 and Im in Latinamerica. Some updates has been relased in Europe and some countries in Latinamerica but mostly in Europe. So My carier did drop the ipdates for the Black -in my case- then I was looking for flash my mobile with another firmware to get the Lumia black update. In the middle of the searching I got a suggestion to upgrade to Wndows 8.1 and since then I have noticed that the feathures looks like the "Lumia Black" So in my experience -and despite I could be wrong- I can tell than the results after the windows 8.1 update has been released are pretty much the same than to upgrade to "Lumia Black"
For to upgrade to Windows 8.1 U have to:
1.sign up with your Microsoft account as developer account from the link:
Windows App Studio - Microsoft
when you open the link,select "start new project" option.Now sign in with your Microsoft account.Accept the terms and click register.
2.Download "PREVIEW FOR DEVELOPERS " app from windows store
3.Open the app ,accept the terms & sign in with your developer account.After sign in ,enable Preview for developer option & you will be part of Preview for developer program.
4.Go to settings & check for phone updates.Small update will be available now.Install the update.(This is not 8.1 update,but due to this update it will be easier to download and install 8.1 update.)
This update will take 5-10 mins.
5.When above update is complete,again go to settings & check for updates.Windows 8.1 update will be available now.Download and install the update.
Update will take about 15 to 20 mins or it can take longer than that.Before installing update,charge your phone's battery above 80%.
By following above steps you can get update on any windows devices.
(The steps were taken from
https://www.youtube.com/watch?v=btdBKF6gUn8